31212023030221 has 4 divisors (see below), whose sum is σ = 34049479669344. Its totient is φ = 28374566391100.

The previous prime is 31212023030191. The next prime is 31212023030281. The reversal of 31212023030221 is 12203032021213.

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 31212023030221 - 2⁷ = 31212023030093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212023030192 and 31212023030201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212023030281) 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, 1418728319545 + ... + 1418728319566.

It is an arithmetic number, because the mean of its divisors is an integer number (8512369917336).

Almost surely, 2^{31212023030221} is an apocalyptic number.

It is an amenable number.

31212023030221 is a deficient number, since it is larger than the sum of its proper divisors (2837456639123).

31212023030221 is a wasteful number, since it uses less digits than its factorization.

31212023030221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837456639122.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31212023030221 its reverse (12203032021213), we get a palindrome (43415055051434).

The spelling of 31212023030221 in words is "thirty-one trillion, two hundred twelve billion, twenty-three million, thirty thousand, two hundred twenty-one".