201220210100 has 108 divisors (see below), whose sum is σ = 547009575084. Its totient is φ = 63682859520.

The previous prime is 201220210097. The next prime is 201220210111. The reversal of 201220210100 is 1012022102.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1843671844 + 199376538256 = 42938^2 + 446516^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1515737 + ... + 1643136.

It is an arithmetic number, because the mean of its divisors is an integer number (5064903473).

Almost surely, 2^201220210100 is an apocalyptic number.

201220210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201220210100 is an abundant number, since it is smaller than the sum of its proper divisors (345789364984).

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

201220210100 is a wasteful number, since it uses less digits than its factorization.

201220210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158914 (or 3158900 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201220210100 its reverse (1012022102), we get a palindrome (202232232202).

The spelling of 201220210100 in words is "two hundred one billion, two hundred twenty million, two hundred ten thousand, one hundred".