21024261431 has 2 divisors, whose sum is σ = 21024261432. Its totient is φ = 21024261430.

The previous prime is 21024261361. The next prime is 21024261469. The reversal of 21024261431 is 13416242012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21024261431 - 2¹⁸ = 21023999287 is a prime.

It is a super-2 number, since 2×21024261431² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21024261431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21024261481) 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 as a sum of consecutive naturals, namely, 10512130715 + 10512130716.

It is an arithmetic number, because the mean of its divisors is an integer number (10512130716).

Almost surely, 2^21024261431 is an apocalyptic number.

21024261431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024261431 is an equidigital number, since it uses as much as digits as its factorization.

21024261431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 21024261431 in words is "twenty-one billion, twenty-four million, two hundred sixty-one thousand, four hundred thirty-one".