212121311031231 has 32 divisors (see below), whose sum is σ = 325873753374720. Its totient is φ = 120222261282816.

The previous prime is 212121311031199. The next prime is 212121311031241. The reversal of 212121311031231 is 132130113121212.

It is not a de Polignac number, because 212121311031231 - 2⁵ = 212121311031199 is a prime.

It is a super-2 number, since 2×212121311031231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121311031241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2695906 + ... + 20772831.

It is an arithmetic number, because the mean of its divisors is an integer number (10183554792960).

Almost surely, 2^{212121311031231} is an apocalyptic number.

212121311031231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212121311031231 is a deficient number, since it is larger than the sum of its proper divisors (113752442343489).

212121311031231 is a wasteful number, since it uses less digits than its factorization.

212121311031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23472263.

The product of its (nonzero) digits is 432, while the sum is 24.

Adding to 212121311031231 its reverse (132130113121212), we get a palindrome (344251424152443).

The spelling of 212121311031231 in words is "two hundred twelve trillion, one hundred twenty-one billion, three hundred eleven million, thirty-one thousand, two hundred thirty-one".