220121012 has 6 divisors (see below), whose sum is σ = 385211778. Its totient is φ = 110060504.

The previous prime is 220120993. The next prime is 220121021. The reversal of 220121012 is 210121022.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 217444516 + 2676496 = 14746^2 + 1636^2 .

It is a junction number, because it is equal to n+sod(n) for n = 220120984 and 220121002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27515123 + ... + 27515130.

It is an arithmetic number, because the mean of its divisors is an integer number (64201963).

Almost surely, 2^220121012 is an apocalyptic number.

It is an amenable number.

220121012 is a deficient number, since it is larger than the sum of its proper divisors (165090766).

220121012 is a wasteful number, since it uses less digits than its factorization.

220121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55030257 (or 55030255 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 220121012 is about 14836.4757270721. The cubic root of 220121012 is about 603.7917392311.

Adding to 220121012 its reverse (210121022), we get a palindrome (430242034).

The spelling of 220121012 in words is "two hundred twenty million, one hundred twenty-one thousand, twelve".