21312233002031 has 4 divisors (see below), whose sum is σ = 21455268123000. Its totient is φ = 21169197881064.

The previous prime is 21312233001967. The next prime is 21312233002069. The reversal of 21312233002031 is 13020033221312.

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 21312233002031 - 2⁶ = 21312233001967 is a prime.

It is a super-2 number, since 2×21312233002031² (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 = 21312233001988 and 21312233002006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312233902031) 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, 71517560261 + ... + 71517560558.

It is an arithmetic number, because the mean of its divisors is an integer number (5363817030750).

Almost surely, 2^{21312233002031} is an apocalyptic number.

21312233002031 is a deficient number, since it is larger than the sum of its proper divisors (143035120969).

21312233002031 is a wasteful number, since it uses less digits than its factorization.

21312233002031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143035120968.

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

Adding to 21312233002031 its reverse (13020033221312), we get a palindrome (34332266223343).

The spelling of 21312233002031 in words is "twenty-one trillion, three hundred twelve billion, two hundred thirty-three million, two thousand, thirty-one".