2101025021 has 16 divisors (see below), whose sum is σ = 2170291200. Its totient is φ = 2032793280.

The previous prime is 2101025009. The next prime is 2101025027. The reversal of 2101025021 is 1205201012.

It is a cyclic number.

It is not a de Polignac number, because 2101025021 - 2⁶ = 2101024957 is a prime.

It is a super-2 number, since 2×2101025021² = 8828612277736100882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101024987 and 2101025005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101025027) 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, 2865971 + ... + 2866703.

It is an arithmetic number, because the mean of its divisors is an integer number (135643200).

Almost surely, 2^2101025021 is an apocalyptic number.

It is an amenable number.

2101025021 is a deficient number, since it is larger than the sum of its proper divisors (69266179).

2101025021 is a wasteful number, since it uses less digits than its factorization.

2101025021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 2101025021 is about 45836.9394811652. The cubic root of 2101025021 is about 1280.7874835634.

Adding to 2101025021 its reverse (1205201012), we get a palindrome (3306226033).

The spelling of 2101025021 in words is "two billion, one hundred one million, twenty-five thousand, twenty-one".