201021202100 has 18 divisors (see below), whose sum is σ = 436216008774. Its totient is φ = 80408480800.

The previous prime is 201021202099. The next prime is 201021202103. The reversal of 201021202100 is 1202120102.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2638260496 + 198382941604 = 51364^2 + 445402^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021202103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1005105911 + ... + 1005106110.

Almost surely, 2^201021202100 is an apocalyptic number.

201021202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021202100 is an abundant number, since it is smaller than the sum of its proper divisors (235194806674).

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

201021202100 is a wasteful number, since it uses less digits than its factorization.

201021202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010212035 (or 2010212028 counting only the distinct ones).

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

Adding to 201021202100 its reverse (1202120102), we get a palindrome (202223322202).

The spelling of 201021202100 in words is "two hundred one billion, twenty-one million, two hundred two thousand, one hundred".