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21321044431 = 42150643811
BaseRepresentation
bin10011110110110101…
…010101000111001111
32001000220022021112021
4103312311111013033
5322131141410211
613443355551011
71353232613251
oct236665250717
961026267467
1021321044431
1190511a0285
12417045b467
13201a2a052b
141063923cd1
1584bc16771
hex4f6d551cf

21321044431 has 4 divisors (see below), whose sum is σ = 21371688664. Its totient is φ = 21270400200.

The previous prime is 21321044401. The next prime is 21321044447. The reversal of 21321044431 is 13444012312.

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

It is a cyclic number.

It is not a de Polignac number, because 21321044431 - 225 = 21287489999 is a prime.

It is a super-2 number, since 2×213210444312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321044396 and 21321044405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321044401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25321485 + ... + 25322326.

It is an arithmetic number, because the mean of its divisors is an integer number (5342922166).

Almost surely, 221321044431 is an apocalyptic number.

21321044431 is a deficient number, since it is larger than the sum of its proper divisors (50644233).

21321044431 is an equidigital number, since it uses as much as digits as its factorization.

21321044431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50644232.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21321044431 its reverse (13444012312), we get a palindrome (34765056743).

The spelling of 21321044431 in words is "twenty-one billion, three hundred twenty-one million, forty-four thousand, four hundred thirty-one".

Divisors: 1 421 50643811 21321044431