21230031203131 has 4 divisors (see below), whose sum is σ = 21322738763200. Its totient is φ = 21137323643064.

The previous prime is 21230031203039. The next prime is 21230031203197. The reversal of 21230031203131 is 13130213003212.

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 21230031203131 - 2⁹ = 21230031202619 is a prime.

It is a super-2 number, since 2×21230031203131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230031203831) 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, 46353779691 + ... + 46353780148.

It is an arithmetic number, because the mean of its divisors is an integer number (5330684690800).

Almost surely, 2^{21230031203131} is an apocalyptic number.

21230031203131 is a deficient number, since it is larger than the sum of its proper divisors (92707560069).

21230031203131 is an equidigital number, since it uses as much as digits as its factorization.

21230031203131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92707560068.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21230031203131 its reverse (13130213003212), we get a palindrome (34360244206343).

The spelling of 21230031203131 in words is "twenty-one trillion, two hundred thirty billion, thirty-one million, two hundred three thousand, one hundred thirty-one".