2100220021 has 8 divisors (see below), whose sum is σ = 2113896960. Its totient is φ = 2086581552.

The previous prime is 2100220007. The next prime is 2100220027. The reversal of 2100220021 is 1200220012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2100220021 - 2⁷ = 2100219893 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 (2100220027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104256 + ... + 122758.

It is an arithmetic number, because the mean of its divisors is an integer number (264237120).

Almost surely, 2^2100220021 is an apocalyptic number.

It is an amenable number.

2100220021 is a deficient number, since it is larger than the sum of its proper divisors (13676939).

2100220021 is a wasteful number, since it uses less digits than its factorization.

2100220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19235.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2100220021 is about 45828.1575126035. The cubic root of 2100220021 is about 1280.6238863318.

Adding to 2100220021 its reverse (1200220012), we get a palindrome (3300440033).

Subtracting from 2100220021 its reverse (1200220012), we obtain a palindrome (900000009).

The spelling of 2100220021 in words is "two billion, one hundred million, two hundred twenty thousand, twenty-one".