2021100102 has 48 divisors (see below), whose sum is σ = 5051434752. Its totient is φ = 572056560.

The previous prime is 2021100089. The next prime is 2021100121. The reversal of 2021100102 is 2010011202.

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 23 ways as a sum of consecutive naturals, for example, 61474 + ... + 88437.

It is an arithmetic number, because the mean of its divisors is an integer number (105238224).

Almost surely, 2^2021100102 is an apocalyptic number.

2021100102 is an abundant number, since it is smaller than the sum of its proper divisors (3030334650).

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

2021100102 is a wasteful number, since it uses less digits than its factorization.

2021100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150033 (or 150030 counting only the distinct ones).

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

The square root of 2021100102 is about 44956.6469167797. The cubic root of 2021100102 is about 1264.3363028361.

Adding to 2021100102 its reverse (2010011202), we get a palindrome (4031111304).

Subtracting from 2021100102 its reverse (2010011202), we obtain a square (11088900 = 3330²).

It can be divided in two parts, 2021100 and 102, that added together give a palindrome (2021202).

The spelling of 2021100102 in words is "two billion, twenty-one million, one hundred thousand, one hundred two".