21051148295431 has 2 divisors, whose sum is σ = 21051148295432. Its totient is φ = 21051148295430.

The previous prime is 21051148295389. The next prime is 21051148295483. The reversal of 21051148295431 is 13459284115012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21051148295431 is a prime.

It is a super-2 number, since 2×21051148295431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21051148295491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525574147715 + 10525574147716.

It is an arithmetic number, because the mean of its divisors is an integer number (10525574147716).

Almost surely, 2^{21051148295431} is an apocalyptic number.

21051148295431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21051148295431 is an equidigital number, since it uses as much as digits as its factorization.

21051148295431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 21051148295431 in words is "twenty-one trillion, fifty-one billion, one hundred forty-eight million, two hundred ninety-five thousand, four hundred thirty-one".