220121544 has 16 divisors (see below), whose sum is σ = 550303920. Its totient is φ = 73373840.

The previous prime is 220121519. The next prime is 220121549. The reversal of 220121544 is 445121022.

220121544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 220121544.

It is not an unprimeable number, because it can be changed into a prime (220121549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4585842 + ... + 4585889.

It is an arithmetic number, because the mean of its divisors is an integer number (34393995).

Almost surely, 2^220121544 is an apocalyptic number.

220121544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

220121544 is an abundant number, since it is smaller than the sum of its proper divisors (330182376).

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

220121544 is a wasteful number, since it uses less digits than its factorization.

220121544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9171740 (or 9171736 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 220121544 is about 14836.4936558474. The cubic root of 220121544 is about 603.7922256559.

Adding to 220121544 its reverse (445121022), we get a palindrome (665242566).

The spelling of 220121544 in words is "two hundred twenty million, one hundred twenty-one thousand, five hundred forty-four".