220400121 has 16 divisors (see below), whose sum is σ = 314181504. Its totient is φ = 136944384.

The previous prime is 220400107. The next prime is 220400123. The reversal of 220400121 is 121004022.

220400121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220400121 - 2⁹ = 220399609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220400097 and 220400106.

It is not an unprimeable number, because it can be changed into a prime (220400123) 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, 15726 + ... + 26231.

It is an arithmetic number, because the mean of its divisors is an integer number (19636344).

Almost surely, 2^220400121 is an apocalyptic number.

It is an amenable number.

220400121 is a deficient number, since it is larger than the sum of its proper divisors (93781383).

220400121 is a wasteful number, since it uses less digits than its factorization.

220400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42080.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 220400121 is about 14845.8789231221. The cubic root of 220400121 is about 604.0468300240.

Adding to 220400121 its reverse (121004022), we get a palindrome (341404143).

It can be divided in two parts, 2204001 and 21, that added together give a palindrome (2204022).

The spelling of 220400121 in words is "two hundred twenty million, four hundred thousand, one hundred twenty-one".