21243076957492 has 24 divisors (see below), whose sum is σ = 40115260220000. Its totient is φ = 9784848754656.

The previous prime is 21243076957481. The next prime is 21243076957493. The reversal of 21243076957492 is 29475967034212.

It is a self number, because there is not a number n which added to its sum of digits gives 21243076957492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243076957493) 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, 409313442 + ... + 409365337.

Almost surely, 2^{21243076957492} is an apocalyptic number.

It is an amenable number.

21243076957492 is a deficient number, since it is larger than the sum of its proper divisors (18872183262508).

21243076957492 is a wasteful number, since it uses less digits than its factorization.

21243076957492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818679295 (or 818679293 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 61.

The spelling of 21243076957492 in words is "twenty-one trillion, two hundred forty-three billion, seventy-six million, nine hundred fifty-seven thousand, four hundred ninety-two".