2100021101 has 6 divisors (see below), whose sum is σ = 2230818570. Its totient is φ = 1976490176.

The previous prime is 2100021089. The next prime is 2100021103. The reversal of 2100021101 is 1011200012.

It can be written as a sum of positive squares in 3 ways, for example, as 367297225 + 1732723876 = 19165^2 + 41626^2 .

It is not a de Polignac number, because 2100021101 - 2¹⁸ = 2099758957 is a prime.

It is a Duffinian number.

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 5 ways as a sum of consecutive naturals, for example, 3632966 + ... + 3633543.

It is an arithmetic number, because the mean of its divisors is an integer number (371803095).

Almost surely, 2^2100021101 is an apocalyptic number.

It is an amenable number.

2100021101 is a deficient number, since it is larger than the sum of its proper divisors (130797469).

2100021101 is an equidigital number, since it uses as much as digits as its factorization.

2100021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7266543 (or 7266526 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2100021101 is about 45825.9871797652. The cubic root of 2100021101 is about 1280.5834541003.

Adding to 2100021101 its reverse (1011200012), we get a palindrome (3111221113).

The spelling of 2100021101 in words is "two billion, one hundred million, twenty-one thousand, one hundred one".