21320012233031 has 4 divisors (see below), whose sum is σ = 21404952521064. Its totient is φ = 21235071945000.

The previous prime is 21320012233001. The next prime is 21320012233073. The reversal of 21320012233031 is 13033221002312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21320012233031 is a prime.

It is a super-2 number, since 2×21320012233031² (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 = 21320012232988 and 21320012233006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320012233001) 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, 42470143640 + ... + 42470144141.

It is an arithmetic number, because the mean of its divisors is an integer number (5351238130266).

Almost surely, 2^{21320012233031} is an apocalyptic number.

21320012233031 is a deficient number, since it is larger than the sum of its proper divisors (84940288033).

21320012233031 is an equidigital number, since it uses as much as digits as its factorization.

21320012233031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84940288032.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21320012233031 its reverse (13033221002312), we get a palindrome (34353233235343).

The spelling of 21320012233031 in words is "twenty-one trillion, three hundred twenty billion, twelve million, two hundred thirty-three thousand, thirty-one".