21707511431 has 2 divisors, whose sum is σ = 21707511432. Its totient is φ = 21707511430.

The previous prime is 21707511409. The next prime is 21707511437. The reversal of 21707511431 is 13411570712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21707511431 - 2⁶ = 21707511367 is a prime.

It is a super-2 number, since 2×21707511431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21707511437) 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 as a sum of consecutive naturals, namely, 10853755715 + 10853755716.

It is an arithmetic number, because the mean of its divisors is an integer number (10853755716).

Almost surely, 2^21707511431 is an apocalyptic number.

21707511431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21707511431 is an equidigital number, since it uses as much as digits as its factorization.

21707511431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 32.

The spelling of 21707511431 in words is "twenty-one billion, seven hundred seven million, five hundred eleven thousand, four hundred thirty-one".