21500157737474 has 8 divisors (see below), whose sum is σ = 34731024037500. Its totient is φ = 9923149724976.

The previous prime is 21500157737467. The next prime is 21500157737483. The reversal of 21500157737474 is 47473775100512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17924681400025 + 3575476337449 = 4233755^2 + 1890893^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21500157737474² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413464571849 + ... + 413464571900.

Almost surely, 2^{21500157737474} is an apocalyptic number.

21500157737474 is a deficient number, since it is larger than the sum of its proper divisors (13230866300026).

21500157737474 is a wasteful number, since it uses less digits than its factorization.

21500157737474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826929143764.

The product of its (nonzero) digits is 5762400, while the sum is 53.

The spelling of 21500157737474 in words is "twenty-one trillion, five hundred billion, one hundred fifty-seven million, seven hundred thirty-seven thousand, four hundred seventy-four".