21012300233031 has 4 divisors (see below), whose sum is σ = 28016400310712. Its totient is φ = 14008200155352.

The previous prime is 21012300233003. The next prime is 21012300233053. The reversal of 21012300233031 is 13033200321012.

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

It is not a de Polignac number, because 21012300233031 - 2⁶ = 21012300232967 is a prime.

It is a super-2 number, since 2×21012300233031² (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 = 21012300232989 and 21012300233007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012300233831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3502050038836 + ... + 3502050038841.

It is an arithmetic number, because the mean of its divisors is an integer number (7004100077678).

Almost surely, 2^{21012300233031} is an apocalyptic number.

21012300233031 is a deficient number, since it is larger than the sum of its proper divisors (7004100077681).

21012300233031 is an equidigital number, since it uses as much as digits as its factorization.

21012300233031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004100077680.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21012300233031 its reverse (13033200321012), we get a palindrome (34045500554043).

The spelling of 21012300233031 in words is "twenty-one trillion, twelve billion, three hundred million, two hundred thirty-three thousand, thirty-one".