21243076957507 has 2 divisors, whose sum is σ = 21243076957508. Its totient is φ = 21243076957506.

The previous prime is 21243076957493. The next prime is 21243076957567. The reversal of 21243076957507 is 70575967034212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21243076957507 - 2⁴³ = 12446983935299 is a prime.

It is not a weakly prime, because it can be changed into another prime (21243076957567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621538478753 + 10621538478754.

It is an arithmetic number, because the mean of its divisors is an integer number (10621538478754).

Almost surely, 2^{21243076957507} is an apocalyptic number.

21243076957507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21243076957507 is an equidigital number, since it uses as much as digits as its factorization.

21243076957507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22226400, while the sum is 58.

The spelling of 21243076957507 in words is "twenty-one trillion, two hundred forty-three billion, seventy-six million, nine hundred fifty-seven thousand, five hundred seven".