122100401556 has 72 divisors (see below), whose sum is σ = 371299481280. Its totient is φ = 33049731456.

The previous prime is 122100401513. The next prime is 122100401641. The reversal of 122100401556 is 655104001221.

122100401556 is a `hidden beast` number, since 1 + 2 + 2 + 100 + 4 + 0 + 1 + 556 = 666.

It is a super-2 number, since 2×122100401556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12745881 + ... + 12755456.

It is an arithmetic number, because the mean of its divisors is an integer number (5156937240).

Almost surely, 2^122100401556 is an apocalyptic number.

It is an amenable number.

122100401556 is an abundant number, since it is smaller than the sum of its proper divisors (249199079724).

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

122100401556 is a wasteful number, since it uses less digits than its factorization.

122100401556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25501373 (or 25501368 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 122100401556 its reverse (655104001221), we get a palindrome (777204402777).

The spelling of 122100401556 in words is "one hundred twenty-two billion, one hundred million, four hundred one thousand, five hundred fifty-six".