220121442 has 32 divisors (see below), whose sum is σ = 496056960. Its totient is φ = 72339120.

The previous prime is 220121437. The next prime is 220121449. The reversal of 220121442 is 244121022.

220121442 is a `hidden beast` number, since 2 + 201 + 21 + 442 = 666.

220121442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (220121449) 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, 24873 + ... + 32540.

It is an arithmetic number, because the mean of its divisors is an integer number (15501780).

Almost surely, 2^220121442 is an apocalyptic number.

220121442 is an abundant number, since it is smaller than the sum of its proper divisors (275935518).

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

220121442 is a wasteful number, since it uses less digits than its factorization.

220121442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57495 (or 57489 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 220121442 is about 14836.4902183771. The cubic root of 220121442 is about 603.7921323940.

Adding to 220121442 its reverse (244121022), we get a palindrome (464242464).

The spelling of 220121442 in words is "two hundred twenty million, one hundred twenty-one thousand, four hundred forty-two".