21023010131 has 4 divisors (see below), whose sum is σ = 21591199632. Its totient is φ = 20454820632.

The previous prime is 21023010061. The next prime is 21023010139. The reversal of 21023010131 is 13101032012.

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 21023010131 - 2¹⁰ = 21023009107 is a prime.

It is a super-2 number, since 2×21023010131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21023010139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284094695 + ... + 284094768.

It is an arithmetic number, because the mean of its divisors is an integer number (5397799908).

Almost surely, 2^21023010131 is an apocalyptic number.

21023010131 is a deficient number, since it is larger than the sum of its proper divisors (568189501).

21023010131 is an equidigital number, since it uses as much as digits as its factorization.

21023010131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568189500.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21023010131 its reverse (13101032012), we get a palindrome (34124042143).

The spelling of 21023010131 in words is "twenty-one billion, twenty-three million, ten thousand, one hundred thirty-one".