21496753286531 has 2 divisors, whose sum is σ = 21496753286532. Its totient is φ = 21496753286530.

The previous prime is 21496753286381. The next prime is 21496753286537. The reversal of 21496753286531 is 13568235769412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21496753286531 - 2³⁰ = 21495679544707 is a prime.

It is a super-2 number, since 2×21496753286531² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21496753286537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10748376643265 + 10748376643266.

It is an arithmetic number, because the mean of its divisors is an integer number (10748376643266).

Almost surely, 2^{21496753286531} is an apocalyptic number.

21496753286531 is a deficient number, since it is larger than the sum of its proper divisors (1).

21496753286531 is an equidigital number, since it uses as much as digits as its factorization.

21496753286531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65318400, while the sum is 62.

The spelling of 21496753286531 in words is "twenty-one trillion, four hundred ninety-six billion, seven hundred fifty-three million, two hundred eighty-six thousand, five hundred thirty-one".