212120023231 has 16 divisors (see below), whose sum is σ = 228506572800. Its totient is φ = 196307647200.

The previous prime is 212120023177. The next prime is 212120023243. The reversal of 212120023231 is 132320021212.

It is a cyclic number.

It is not a de Polignac number, because 212120023231 - 2²⁵ = 212086468799 is a prime.

It is a super-2 number, since 2×212120023231² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120023199 and 212120023208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120026231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574255 + ... + 868336.

It is an arithmetic number, because the mean of its divisors is an integer number (14281660800).

Almost surely, 2^212120023231 is an apocalyptic number.

212120023231 is a deficient number, since it is larger than the sum of its proper divisors (16386549569).

212120023231 is a wasteful number, since it uses less digits than its factorization.

212120023231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442790.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 212120023231 its reverse (132320021212), we get a palindrome (344440044443).

The spelling of 212120023231 in words is "two hundred twelve billion, one hundred twenty million, twenty-three thousand, two hundred thirty-one".