21120552340131 has 32 divisors (see below), whose sum is σ = 29015054779392. Its totient is φ = 13657873047840.

The previous prime is 21120552340123. The next prime is 21120552340163. The reversal of 21120552340131 is 13104325502112.

It is a happy number.

It is not a de Polignac number, because 21120552340131 - 2³ = 21120552340123 is a prime.

It is a super-2 number, since 2×21120552340131² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21120552340631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26586196 + ... + 27369086.

It is an arithmetic number, because the mean of its divisors is an integer number (906720461856).

Almost surely, 2^{21120552340131} is an apocalyptic number.

21120552340131 is a deficient number, since it is larger than the sum of its proper divisors (7894502439261).

21120552340131 is a wasteful number, since it uses less digits than its factorization.

21120552340131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784383.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21120552340131 its reverse (13104325502112), we get a palindrome (34224877842243).

The spelling of 21120552340131 in words is "twenty-one trillion, one hundred twenty billion, five hundred fifty-two million, three hundred forty thousand, one hundred thirty-one".