31213233322021 has 4 divisors (see below), whose sum is σ = 31223767659552. Its totient is φ = 31202698984492.

The previous prime is 31213233322003. The next prime is 31213233322027. The reversal of 31213233322021 is 12022333231213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31213233322021 - 2⁹ = 31213233321509 is a prime.

It is a super-2 number, since 2×31213233322021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213233322027) 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, 5267164321 + ... + 5267170246.

It is an arithmetic number, because the mean of its divisors is an integer number (7805941914888).

Almost surely, 2^{31213233322021} is an apocalyptic number.

It is an amenable number.

31213233322021 is a deficient number, since it is larger than the sum of its proper divisors (10534337531).

31213233322021 is a wasteful number, since it uses less digits than its factorization.

31213233322021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10534337530.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 31213233322021 its reverse (12022333231213), we get a palindrome (43235566553234).

The spelling of 31213233322021 in words is "thirty-one trillion, two hundred thirteen billion, two hundred thirty-three million, three hundred twenty-two thousand, twenty-one".