21320100431 has 32 divisors (see below), whose sum is σ = 26017382400. Its totient is φ = 17064159840.

The previous prime is 21320100421. The next prime is 21320100463. The reversal of 21320100431 is 13400102312.

It is a de Polignac number, because none of the positive numbers 2^k-21320100431 is a prime.

It is a super-2 number, since 2×21320100431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320100421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7805336 + ... + 7808066.

It is an arithmetic number, because the mean of its divisors is an integer number (813043200).

Almost surely, 2^21320100431 is an apocalyptic number.

21320100431 is a deficient number, since it is larger than the sum of its proper divisors (4697281969).

21320100431 is a wasteful number, since it uses less digits than its factorization.

21320100431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21320100431 its reverse (13400102312), we get a palindrome (34720202743).

The spelling of 21320100431 in words is "twenty-one billion, three hundred twenty million, one hundred thousand, four hundred thirty-one".