21500235202730 has 8 divisors (see below), whose sum is σ = 38700423364932. Its totient is φ = 8600094081088.

The previous prime is 21500235202717. The next prime is 21500235202763. The reversal of 21500235202730 is 3720253200512.

It can be written as a sum of positive squares in 2 ways, for example, as 20541988034929 + 958247167801 = 4532327^2 + 978901^2 .

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

It is a super-2 number, since 2×21500235202730² (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, 1075011760127 + ... + 1075011760146.

Almost surely, 2^{21500235202730} is an apocalyptic number.

21500235202730 is a deficient number, since it is larger than the sum of its proper divisors (17200188162202).

21500235202730 is a wasteful number, since it uses less digits than its factorization.

21500235202730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150023520280.

The product of its (nonzero) digits is 25200, while the sum is 32.

The spelling of 21500235202730 in words is "twenty-one trillion, five hundred billion, two hundred thirty-five million, two hundred two thousand, seven hundred thirty".