1220121231 has 16 divisors (see below), whose sum is σ = 1860090624. Its totient is φ = 696890304.

The previous prime is 1220121169. The next prime is 1220121247. The reversal of 1220121231 is 1321210221.

It is not a de Polignac number, because 1220121231 - 2⁶ = 1220121167 is a prime.

It is a super-2 number, since 2×1220121231² = 2977391636673910722, 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 1220121231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121251) 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, 37696 + ... + 62138.

It is an arithmetic number, because the mean of its divisors is an integer number (116255664).

Almost surely, 2^1220121231 is an apocalyptic number.

1220121231 is a deficient number, since it is larger than the sum of its proper divisors (639969393).

1220121231 is a wasteful number, since it uses less digits than its factorization.

1220121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26830.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1220121231 is about 34930.2337667528. The cubic root of 1220121231 is about 1068.5651221263.

Adding to 1220121231 its reverse (1321210221), we get a palindrome (2541331452).

The spelling of 1220121231 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred thirty-one".