220121020 has 48 divisors (see below), whose sum is σ = 546517440. Its totient is φ = 72866304.

The previous prime is 220120993. The next prime is 220121021. The reversal of 220121020 is 20121022.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 220120988 and 220121006.

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 15 ways as a sum of consecutive naturals, for example, 23049 + ... + 31168.

It is an arithmetic number, because the mean of its divisors is an integer number (11385780).

Almost surely, 2^220121020 is an apocalyptic number.

220121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220121020 is an abundant number, since it is smaller than the sum of its proper divisors (326396420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220121020 is a wasteful number, since it uses less digits than its factorization.

220121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54262 (or 54260 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 220121020 is about 14836.4759966779. The cubic root of 220121020 is about 603.7917465457.

Adding to 220121020 its reverse (20121022), we get a palindrome (240242042).

It can be divided in two parts, 22012 and 1020, that added together give a palindrome (23032).

The spelling of 220121020 in words is "two hundred twenty million, one hundred twenty-one thousand, twenty".