21520252510 has 16 divisors (see below), whose sum is σ = 39171697200. Its totient is φ = 8511380416.

The previous prime is 21520252493. The next prime is 21520252513. The reversal of 21520252510 is 1525202512.

It is a super-2 number, since 2×21520252510² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520252513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12089140 + ... + 12090919.

It is an arithmetic number, because the mean of its divisors is an integer number (2448231075).

Almost surely, 2^21520252510 is an apocalyptic number.

21520252510 is a deficient number, since it is larger than the sum of its proper divisors (17651444690).

21520252510 is a wasteful number, since it uses less digits than its factorization.

21520252510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24180155.

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 21520252510 in words is "twenty-one billion, five hundred twenty million, two hundred fifty-two thousand, five hundred ten".