21520504110730 has 8 divisors (see below), whose sum is σ = 38736907399332. Its totient is φ = 8608201644288.

The previous prime is 21520504110719. The next prime is 21520504110751. The reversal of 21520504110730 is 3701140502512.

It can be written as a sum of positive squares in 2 ways, for example, as 18591179439001 + 2929324671729 = 4311749^2 + 1711527^2 .

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

It is a super-2 number, since 2×21520504110730² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21520504110692 and 21520504110701.

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, 1076025205527 + ... + 1076025205546.

Almost surely, 2^{21520504110730} is an apocalyptic number.

21520504110730 is a deficient number, since it is larger than the sum of its proper divisors (17216403288602).

21520504110730 is a wasteful number, since it uses less digits than its factorization.

21520504110730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152050411080.

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 21520504110730 in words is "twenty-one trillion, five hundred twenty billion, five hundred four million, one hundred ten thousand, seven hundred thirty".