20315124541621 has 32 divisors (see below), whose sum is σ = 25174439136000. Its totient is φ = 15963471429120.

The previous prime is 20315124541597. The next prime is 20315124541661. The reversal of 20315124541621 is 12614542151302.

It is a cyclic number.

It is not a de Polignac number, because 20315124541621 - 2⁵ = 20315124541589 is a prime.

It is a super-2 number, since 2×20315124541621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315124541661) 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, 104184865 + ... + 104379673.

It is an arithmetic number, because the mean of its divisors is an integer number (786701223000).

Almost surely, 2^{20315124541621} is an apocalyptic number.

It is an amenable number.

20315124541621 is a deficient number, since it is larger than the sum of its proper divisors (4859314594379).

20315124541621 is a wasteful number, since it uses less digits than its factorization.

20315124541621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202669.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 20315124541621 its reverse (12614542151302), we get a palindrome (32929666692923).

The spelling of 20315124541621 in words is "twenty trillion, three hundred fifteen billion, one hundred twenty-four million, five hundred forty-one thousand, six hundred twenty-one".