220115660121 has 36 divisors (see below), whose sum is σ = 369908942832. Its totient is φ = 125761762224.

The previous prime is 220115660113. The next prime is 220115660123. The reversal of 220115660121 is 121066511022.

220115660121 is a `hidden beast` number, since 2 + 2 + 0 + 1 + 1 + 56 + 601 + 2 + 1 = 666.

It is not a de Polignac number, because 220115660121 - 2³ = 220115660113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220115660123) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3284470 + ... + 3350816.

It is an arithmetic number, because the mean of its divisors is an integer number (10275248412).

Almost surely, 2^220115660121 is an apocalyptic number.

220115660121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220115660121 is a deficient number, since it is larger than the sum of its proper divisors (149793282711).

220115660121 is a wasteful number, since it uses less digits than its factorization.

220115660121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73890 (or 73880 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 220115660121 in words is "two hundred twenty billion, one hundred fifteen million, six hundred sixty thousand, one hundred twenty-one".