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21022003243 = 23914000141
BaseRepresentation
bin10011100101000000…
…100101000000101011
32000021001121102010201
4103211000211000223
5321023113100433
613353554253031
71342642036123
oct234500450053
960231542121
1021022003243
118a084111aa
1240a8287177
131ca0349c97
141035d1dc83
15830846a7d
hex4e502502b

21022003243 has 4 divisors (see below), whose sum is σ = 21936003408. Its totient is φ = 20108003080.

The previous prime is 21022003181. The next prime is 21022003333. The reversal of 21022003243 is 34230022012.

Adding to 21022003243 its reverse (34230022012), we get a palindrome (55252025255).

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21022003243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022003243.

It is not an unprimeable number, because it can be changed into a prime (21022003643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457000048 + ... + 457000093.

It is an arithmetic number, because the mean of its divisors is an integer number (5484000852).

Almost surely, 221022003243 is an apocalyptic number.

21022003243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21022003243 is a deficient number, since it is larger than the sum of its proper divisors (914000165).

21022003243 is an equidigital number, since it uses as much as digits as its factorization.

21022003243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914000164.

The product of its (nonzero) digits is 576, while the sum is 19.

The spelling of 21022003243 in words is "twenty-one billion, twenty-two million, three thousand, two hundred forty-three".

Divisors: 1 23 914000141 21022003243