55201212100 has 72 divisors (see below), whose sum is σ = 125395724160. Its totient is φ = 21052711680.

The previous prime is 55201212097. The next prime is 55201212127. The reversal of 55201212100 is 121210255.

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, 681561 + ... + 758239.

It is an arithmetic number, because the mean of its divisors is an integer number (1741607280).

Almost surely, 2^55201212100 is an apocalyptic number.

55201212100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55201212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62697862080).

55201212100 is an abundant number, since it is smaller than the sum of its proper divisors (70194512060).

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

55201212100 is a wasteful number, since it uses less digits than its factorization.

55201212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77029 (or 77022 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 55201212100 its reverse (121210255), we get a palindrome (55322422355).

The spelling of 55201212100 in words is "fifty-five billion, two hundred one million, two hundred twelve thousand, one hundred".