220121031 has 32 divisors (see below), whose sum is σ = 325321920. Its totient is φ = 131549184.

The previous prime is 220121021. The next prime is 220121047. The reversal of 220121031 is 130121022.

It is a de Polignac number, because none of the positive numbers 2^k-220121031 is a prime.

It is a super-2 number, since 2×220121031² = 96906536577005922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 220120998 and 220121016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121021) 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 31 ways as a sum of consecutive naturals, for example, 224815 + ... + 225791.

It is an arithmetic number, because the mean of its divisors is an integer number (10166310).

Almost surely, 2^220121031 is an apocalyptic number.

220121031 is a deficient number, since it is larger than the sum of its proper divisors (105200889).

220121031 is a wasteful number, since it uses less digits than its factorization.

220121031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 220121031 is about 14836.4763673859. The cubic root of 220121031 is about 603.7917566034.

Adding to 220121031 its reverse (130121022), we get a palindrome (350242053).

Subtracting from 220121031 its reverse (130121022), we obtain a palindrome (90000009).

It can be divided in two parts, 2201 and 21031, that added together give a palindrome (23232).

The spelling of 220121031 in words is "two hundred twenty million, one hundred twenty-one thousand, thirty-one".