2100021102 has 48 divisors (see below), whose sum is σ = 4692504960. Its totient is φ = 678426000.

The previous prime is 2100021089. The next prime is 2100021103. The reversal of 2100021102 is 2011200012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100021103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61477 + ... + 89327.

It is an arithmetic number, because the mean of its divisors is an integer number (97760520).

Almost surely, 2^2100021102 is an apocalyptic number.

2100021102 is an abundant number, since it is smaller than the sum of its proper divisors (2592483858).

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

2100021102 is a wasteful number, since it uses less digits than its factorization.

2100021102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27989 (or 27986 counting only the distinct ones).

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

The square root of 2100021102 is about 45825.9871906760. The cubic root of 2100021102 is about 1280.5834543035.

Adding to 2100021102 its reverse (2011200012), we get a palindrome (4111221114).

The spelling of 2100021102 in words is "two billion, one hundred million, twenty-one thousand, one hundred two".