21274551037497 has 16 divisors (see below), whose sum is σ = 29181871824768. Its totient is φ = 13780328340480.

The previous prime is 21274551037477. The next prime is 21274551037547. The reversal of 21274551037497 is 79473015547212.

It is a happy number.

It is not a de Polignac number, because 21274551037497 - 2²⁰ = 21274549988921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21274551037477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649508904 + ... + 649541657.

It is an arithmetic number, because the mean of its divisors is an integer number (1823866989048).

Almost surely, 2^{21274551037497} is an apocalyptic number.

It is an amenable number.

21274551037497 is a deficient number, since it is larger than the sum of its proper divisors (7907320787271).

21274551037497 is a wasteful number, since it uses less digits than its factorization.

21274551037497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299050720.

The product of its (nonzero) digits is 14817600, while the sum is 57.

The spelling of 21274551037497 in words is "twenty-one trillion, two hundred seventy-four billion, five hundred fifty-one million, thirty-seven thousand, four hundred ninety-seven".