21457667360508 has 24 divisors (see below), whose sum is σ = 50068027954560. Its totient is φ = 7152536151600.

The previous prime is 21457667360501. The next prime is 21457667360527. The reversal of 21457667360508 is 80506376675412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21457667360501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2498833 + ... + 7011383.

It is an arithmetic number, because the mean of its divisors is an integer number (2086167831440).

Almost surely, 2^{21457667360508} is an apocalyptic number.

It is an amenable number.

21457667360508 is an abundant number, since it is smaller than the sum of its proper divisors (28610360594052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21457667360508 is a wasteful number, since it uses less digits than its factorization.

21457667360508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908817 (or 4908815 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 60.

The spelling of 21457667360508 in words is "twenty-one trillion, four hundred fifty-seven billion, six hundred sixty-seven million, three hundred sixty thousand, five hundred eight".