21250641434507 has 2 divisors, whose sum is σ = 21250641434508. Its totient is φ = 21250641434506.

The previous prime is 21250641434501. The next prime is 21250641434591. The reversal of 21250641434507 is 70543414605212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21250641434507 - 2⁶ = 21250641434443 is a prime.

It is a super-3 number, since 3×21250641434507³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21250641434501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625320717253 + 10625320717254.

It is an arithmetic number, because the mean of its divisors is an integer number (10625320717254).

Almost surely, 2^{21250641434507} is an apocalyptic number.

21250641434507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250641434507 is an equidigital number, since it uses as much as digits as its factorization.

21250641434507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 21250641434507 in words is "twenty-one trillion, two hundred fifty billion, six hundred forty-one million, four hundred thirty-four thousand, five hundred seven".