21023033131 has 4 divisors (see below), whose sum is σ = 21074434600. Its totient is φ = 20971631664.

The previous prime is 21023033117. The next prime is 21023033167. The reversal of 21023033131 is 13133032012.

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 21023033131 - 2⁵ = 21023033099 is a prime.

It is a super-2 number, since 2×21023033131² (a number of 21 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 = 21023033099 and 21023033108.

It is not an unprimeable number, because it can be changed into a prime (21023033111) 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, 25700121 + ... + 25700938.

It is an arithmetic number, because the mean of its divisors is an integer number (5268608650).

Almost surely, 2^21023033131 is an apocalyptic number.

21023033131 is a deficient number, since it is larger than the sum of its proper divisors (51401469).

21023033131 is an equidigital number, since it uses as much as digits as its factorization.

21023033131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51401468.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21023033131 its reverse (13133032012), we get a palindrome (34156065143).

The spelling of 21023033131 in words is "twenty-one billion, twenty-three million, thirty-three thousand, one hundred thirty-one".