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21243324557 = 713298239781
BaseRepresentation
bin10011110010001100…
…110110100010001101
32000211111001200220102
4103302030312202031
5322001242341212
613431542100445
71351300164560
oct236214664215
960744050812
1021243324557
119011337184
12414a41a725
13200715ac40
1410574924d7
15844eb35c2
hex4f233688d

21243324557 has 32 divisors (see below), whose sum is σ = 27082836480. Its totient is φ = 16206946560.

The previous prime is 21243324551. The next prime is 21243324581. The reversal of 21243324557 is 75542334212.

It is not a de Polignac number, because 21243324557 - 214 = 21243308173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21243324557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243324551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2167007 + ... + 2176787.

It is an arithmetic number, because the mean of its divisors is an integer number (846338640).

Almost surely, 221243324557 is an apocalyptic number.

It is an amenable number.

21243324557 is a deficient number, since it is larger than the sum of its proper divisors (5839511923).

21243324557 is a wasteful number, since it uses less digits than its factorization.

21243324557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10653.

The product of its digits is 201600, while the sum is 38.

Adding to 21243324557 its reverse (75542334212), we get a palindrome (96785658769).

The spelling of 21243324557 in words is "twenty-one billion, two hundred forty-three million, three hundred twenty-four thousand, five hundred fifty-seven".

Divisors: 1 7 13 29 91 203 377 823 2639 5761 9781 10699 23867 68467 74893 127153 167069 283649 310271 890071 1985543 2171897 3687437 8049763 25812059 56348341 104646919 233443127 732528433 1634101889 3034760651 21243324557