20021100102 has 32 divisors (see below), whose sum is σ = 44539336800. Its totient is φ = 6666499584.

The previous prime is 20021100083. The next prime is 20021100119. The reversal of 20021100102 is 20100112002.

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 15 ways as a sum of consecutive naturals, for example, 149383 + ... + 249714.

It is an arithmetic number, because the mean of its divisors is an integer number (1391854275).

Almost surely, 2^20021100102 is an apocalyptic number.

20021100102 is an abundant number, since it is smaller than the sum of its proper divisors (24518236698).

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

20021100102 is a wasteful number, since it uses less digits than its factorization.

20021100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400037 (or 400031 counting only the distinct ones).

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

Adding to 20021100102 its reverse (20100112002), we get a palindrome (40121212104).

The spelling of 20021100102 in words is "twenty billion, twenty-one million, one hundred thousand, one hundred two".