220121231 has 16 divisors (see below), whose sum is σ = 243008640. Its totient is φ = 197730720.

The previous prime is 220121203. The next prime is 220121233. The reversal of 220121231 is 132121022.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-220121231 is a prime.

It is a super-2 number, since 2×220121231² = 96906712673910722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121233) 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, 525140 + ... + 525558.

It is an arithmetic number, because the mean of its divisors is an integer number (15188040).

Almost surely, 2^220121231 is an apocalyptic number.

220121231 is a deficient number, since it is larger than the sum of its proper divisors (22887409).

220121231 is a wasteful number, since it uses less digits than its factorization.

220121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 220121231 is about 14836.4831075292. The cubic root of 220121231 is about 603.7919394699.

Adding to 220121231 its reverse (132121022), we get a palindrome (352242253).

It can be divided in two parts, 2201 and 21231, that added together give a palindrome (23432).

The spelling of 220121231 in words is "two hundred twenty million, one hundred twenty-one thousand, two hundred thirty-one".