210121212231 has 24 divisors (see below), whose sum is σ = 346887166080. Its totient is φ = 120062201616.

The previous prime is 210121212227. The next prime is 210121212239. The reversal of 210121212231 is 132212121012.

210121212231 is a `hidden beast` number, since 210 + 1 + 212 + 12 + 231 = 666.

It is not a de Polignac number, because 210121212231 - 2² = 210121212227 is a prime.

It is a super-2 number, since 2×210121212231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121212239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1095900 + ... + 1273278.

It is an arithmetic number, because the mean of its divisors is an integer number (14453631920).

Almost surely, 2^210121212231 is an apocalyptic number.

210121212231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

210121212231 is a deficient number, since it is larger than the sum of its proper divisors (136765953849).

210121212231 is a wasteful number, since it uses less digits than its factorization.

210121212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196195 (or 196192 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 210121212231 its reverse (132212121012), we get a palindrome (342333333243).

The spelling of 210121212231 in words is "two hundred ten billion, one hundred twenty-one million, two hundred twelve thousand, two hundred thirty-one".