201021110100 has 90 divisors (see below), whose sum is σ = 651631049454. Its totient is φ = 53605627200.

The previous prime is 201021110099. The next prime is 201021110161. The reversal of 201021110100 is 1011120102.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 33861152196 + 167159957904 = 184014^2 + 408852^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 12400611 + ... + 12416810.

Almost surely, 2^201021110100 is an apocalyptic number.

201021110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021110100 is an abundant number, since it is smaller than the sum of its proper divisors (450609939354).

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

201021110100 is a wasteful number, since it uses less digits than its factorization.

201021110100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24817447 (or 24817431 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 201021110100 its reverse (1011120102), we get a palindrome (202032230202).

The spelling of 201021110100 in words is "two hundred one billion, twenty-one million, one hundred ten thousand, one hundred".