1021200202100 has 36 divisors (see below), whose sum is σ = 2386466321484. Its totient is φ = 377058535680.

The previous prime is 1021200202021. The next prime is 1021200202129. The reversal of 1021200202100 is 12020021201.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4317541264 + 1016882660836 = 65708^2 + 1008406^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 392768009 + ... + 392770608.

Almost surely, 2^{1021200202100} is an apocalyptic number.

1021200202100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021200202100 is an abundant number, since it is smaller than the sum of its proper divisors (1365266119384).

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

1021200202100 is a wasteful number, since it uses less digits than its factorization.

1021200202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785538644 (or 785538637 counting only the distinct ones).

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

Adding to 1021200202100 its reverse (12020021201), we get a palindrome (1033220223301).

The spelling of 1021200202100 in words is "one trillion, twenty-one billion, two hundred million, two hundred two thousand, one hundred".