20102021100 has 180 divisors, whose sum is σ = 74471993904. Its totient is φ = 4594734720.

The previous prime is 20102021099. The next prime is 20102021111. The reversal of 20102021100 is 112020102.

It is a tau number, because it is divible by the number of its divisors (180).

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

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 120567 + ... + 233966.

Almost surely, 2^20102021100 is an apocalyptic number.

20102021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102021100 is an abundant number, since it is smaller than the sum of its proper divisors (54369972804).

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

20102021100 is a wasteful number, since it uses less digits than its factorization.

20102021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354566 (or 354550 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20102021100 its reverse (112020102), we get a palindrome (20214041202).

The spelling of 20102021100 in words is "twenty billion, one hundred two million, twenty-one thousand, one hundred".