21013030123131 has 16 divisors (see below), whose sum is σ = 29493928621440. Its totient is φ = 13270507012800.

The previous prime is 21013030123117. The next prime is 21013030123133. The reversal of 21013030123131 is 13132103031012.

It is a happy number.

It is not a de Polignac number, because 21013030123131 - 2¹⁵ = 21013030090363 is a prime.

It is a super-2 number, since 2×21013030123131² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21013030123098 and 21013030123107.

It is not an unprimeable number, because it can be changed into a prime (21013030123133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11360970 + ... + 13080431.

It is an arithmetic number, because the mean of its divisors is an integer number (1843370538840).

Almost surely, 2^{21013030123131} is an apocalyptic number.

21013030123131 is a deficient number, since it is larger than the sum of its proper divisors (8480898498309).

21013030123131 is a wasteful number, since it uses less digits than its factorization.

21013030123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24456506.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 21013030123131 its reverse (13132103031012), we get a palindrome (34145133154143).

The spelling of 21013030123131 in words is "twenty-one trillion, thirteen billion, thirty million, one hundred twenty-three thousand, one hundred thirty-one".