201201122100 has 72 divisors (see below), whose sum is σ = 635063915808. Its totient is φ = 48776028800.

The previous prime is 201201122071. The next prime is 201201122147. The reversal of 201201122100 is 1221102102.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 30481719 + ... + 30488318.

It is an arithmetic number, because the mean of its divisors is an integer number (8820332164).

Almost surely, 2^201201122100 is an apocalyptic number.

201201122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201201122100 is an abundant number, since it is smaller than the sum of its proper divisors (433862793708).

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

201201122100 is a wasteful number, since it uses less digits than its factorization.

201201122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60970065 (or 60970058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201201122100 its reverse (1221102102), we get a palindrome (202422224202).

The spelling of 201201122100 in words is "two hundred one billion, two hundred one million, one hundred twenty-two thousand, one hundred".