21510052211425 has 48 divisors (see below), whose sum is σ = 28117697495040. Its totient is φ = 16298344375040.

The previous prime is 21510052211407. The next prime is 21510052211429. The reversal of 21510052211425 is 52411225001512.

It is not a de Polignac number, because 21510052211425 - 2²⁵ = 21510018656993 is a prime.

It is a super-2 number, since 2×21510052211425² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21510052211429) 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 47 ways as a sum of consecutive naturals, for example, 235999212 + ... + 236090338.

It is an arithmetic number, because the mean of its divisors is an integer number (585785364480).

Almost surely, 2^{21510052211425} is an apocalyptic number.

21510052211425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21510052211425 is a deficient number, since it is larger than the sum of its proper divisors (6607645283615).

21510052211425 is a wasteful number, since it uses less digits than its factorization.

21510052211425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97362 (or 97357 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 21510052211425 its reverse (52411225001512), we get a palindrome (73921277212937).

The spelling of 21510052211425 in words is "twenty-one trillion, five hundred ten billion, fifty-two million, two hundred eleven thousand, four hundred twenty-five".