20212021100 has 36 divisors (see below), whose sum is σ = 44089761408. Its totient is φ = 8042472000.

The previous prime is 20212021099. The next prime is 20212021133. The reversal of 20212021100 is 112021202.

It is a happy 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, 510011 + ... + 548210.

Almost surely, 2^20212021100 is an apocalyptic number.

20212021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212021100 is an abundant number, since it is smaller than the sum of its proper divisors (23877740308).

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

20212021100 is a wasteful number, since it uses less digits than its factorization.

20212021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058426 (or 1058419 counting only the distinct ones).

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

Adding to 20212021100 its reverse (112021202), we get a palindrome (20324042302).

The spelling of 20212021100 in words is "twenty billion, two hundred twelve million, twenty-one thousand, one hundred".