21112023131 has 4 divisors (see below), whose sum is σ = 21329672952. Its totient is φ = 20894373312.

The previous prime is 21112023073. The next prime is 21112023151. The reversal of 21112023131 is 13132021112.

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 21112023131 - 2⁶ = 21112023067 is a prime.

It is a super-2 number, since 2×21112023131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112023151) 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, 108824765 + ... + 108824958.

It is an arithmetic number, because the mean of its divisors is an integer number (5332418238).

Almost surely, 2^21112023131 is an apocalyptic number.

21112023131 is a deficient number, since it is larger than the sum of its proper divisors (217649821).

21112023131 is an equidigital number, since it uses as much as digits as its factorization.

21112023131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217649820.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21112023131 its reverse (13132021112), we get a palindrome (34244044243).

The spelling of 21112023131 in words is "twenty-one billion, one hundred twelve million, twenty-three thousand, one hundred thirty-one".