21113120431 has 16 divisors (see below), whose sum is σ = 23767797760. Its totient is φ = 18621588960.

The previous prime is 21113120401. The next prime is 21113120459. The reversal of 21113120431 is 13402131112.

It is not a de Polignac number, because 21113120431 - 2⁹ = 21113119919 is a prime.

It is a super-2 number, since 2×21113120431² (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 = 21113120399 and 21113120408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113120401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299745 + ... + 363418.

It is an arithmetic number, because the mean of its divisors is an integer number (1485487360).

Almost surely, 2^21113120431 is an apocalyptic number.

21113120431 is a deficient number, since it is larger than the sum of its proper divisors (2654677329).

21113120431 is a wasteful number, since it uses less digits than its factorization.

21113120431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663286.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21113120431 its reverse (13402131112), we get a palindrome (34515251543).

The spelling of 21113120431 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty thousand, four hundred thirty-one".