204021400122 has 12 divisors (see below), whose sum is σ = 442046366970. Its totient is φ = 68007133368.

The previous prime is 204021400109. The next prime is 204021400181. The reversal of 204021400122 is 221004120402.

204021400122 is a `hidden beast` number, since 2 + 0 + 402 + 140 + 0 + 122 = 666.

It can be written as a sum of positive squares in only one way, i.e., 173606388921 + 30415011201 = 416661^2 + 174399^2 .

It is a super-2 number, since 2×204021400122² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 11334522229 = 204021400122 / (2 + 0 + 4 + 0 + 2 + 1 + 4 + 0 + 0 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 204021400095 and 204021400104.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5667261097 + ... + 5667261132.

Almost surely, 2^204021400122 is an apocalyptic number.

204021400122 is an abundant number, since it is smaller than the sum of its proper divisors (238024966848).

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

204021400122 is a wasteful number, since it uses less digits than its factorization.

204021400122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11334522237 (or 11334522234 counting only the distinct ones).

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

Adding to 204021400122 its reverse (221004120402), we get a palindrome (425025520524).

The spelling of 204021400122 in words is "two hundred four billion, twenty-one million, four hundred thousand, one hundred twenty-two".