233112121221 has 24 divisors (see below), whose sum is σ = 361785075744. Its totient is φ = 133124614560.

The previous prime is 233112121211. The next prime is 233112121241. The reversal of 233112121221 is 122121211332.

It is not a de Polignac number, because 233112121221 - 2¹⁸ = 233111859077 is a prime.

It is a super-2 number, since 2×233112121221² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233112121211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250855 + ... + 727428.

It is an arithmetic number, because the mean of its divisors is an integer number (15074378156).

Almost surely, 2^233112121221 is an apocalyptic number.

233112121221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

233112121221 is a deficient number, since it is larger than the sum of its proper divisors (128672954523).

233112121221 is a wasteful number, since it uses less digits than its factorization.

233112121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979921 (or 979914 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 233112121221 its reverse (122121211332), we get a palindrome (355233332553).

The spelling of 233112121221 in words is "two hundred thirty-three billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".