220121331 has 16 divisors (see below), whose sum is σ = 298727808. Its totient is φ = 144144000.

The previous prime is 220121309. The next prime is 220121347. The reversal of 220121331 is 133121022.

It is not a de Polignac number, because 220121331 - 2⁷ = 220121203 is a prime.

It is a super-2 number, since 2×220121331² = 96906800722423122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220121331.

It is not an unprimeable number, because it can be changed into a prime (220121381) 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, 79236 + ... + 81966.

It is an arithmetic number, because the mean of its divisors is an integer number (18670488).

Almost surely, 2^220121331 is an apocalyptic number.

220121331 is a deficient number, since it is larger than the sum of its proper divisors (78606477).

220121331 is a wasteful number, since it uses less digits than its factorization.

220121331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 220121331 is about 14836.4864775997. The cubic root of 220121331 is about 603.7920309032.

Adding to 220121331 its reverse (133121022), we get a palindrome (353242353).

It can be divided in two parts, 2201 and 21331, that added together give a palindrome (23532).

The spelling of 220121331 in words is "two hundred twenty million, one hundred twenty-one thousand, three hundred thirty-one".