21023312013131 has 4 divisors (see below), whose sum is σ = 21024406255632. Its totient is φ = 21022217770632.

The previous prime is 21023312013101. The next prime is 21023312013167. The reversal of 21023312013131 is 13131021332012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21023312013131 - 2¹⁴ = 21023311996747 is a prime.

It is a super-2 number, since 2×21023312013131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21023312013097 and 21023312013106.

It is not an unprimeable number, because it can be changed into a prime (21023312013101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547092431 + ... + 547130856.

It is an arithmetic number, because the mean of its divisors is an integer number (5256101563908).

Almost surely, 2^{21023312013131} is an apocalyptic number.

21023312013131 is a deficient number, since it is larger than the sum of its proper divisors (1094242501).

21023312013131 is a wasteful number, since it uses less digits than its factorization.

21023312013131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094242500.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21023312013131 its reverse (13131021332012), we get a palindrome (34154333345143).

The spelling of 21023312013131 in words is "twenty-one trillion, twenty-three billion, three hundred twelve million, thirteen thousand, one hundred thirty-one".