2100130021 has 16 divisors (see below), whose sum is σ = 2451182400. Its totient is φ = 1779062400.

The previous prime is 2100130013. The next prime is 2100130051. The reversal of 2100130021 is 1200310012.

It is a cyclic number.

It is not a de Polignac number, because 2100130021 - 2³ = 2100130013 is a prime.

It is a super-2 number, since 2×2100130021² = 8821092210210920882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100130001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69616 + ... + 95113.

It is an arithmetic number, because the mean of its divisors is an integer number (153198900).

Almost surely, 2^2100130021 is an apocalyptic number.

It is an amenable number.

2100130021 is a deficient number, since it is larger than the sum of its proper divisors (351052379).

2100130021 is a wasteful number, since it uses less digits than its factorization.

2100130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164820.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2100130021 is about 45827.1755730156. The cubic root of 2100130021 is about 1280.6055933601.

Adding to 2100130021 its reverse (1200310012), we get a palindrome (3300440033).

Subtracting from 2100130021 its reverse (1200310012), we obtain a square (899820009 = 29997²).

The spelling of 2100130021 in words is "two billion, one hundred million, one hundred thirty thousand, twenty-one".