2101002021 has 24 divisors (see below), whose sum is σ = 3063250944. Its totient is φ = 1387562400.

The previous prime is 2101002011. The next prime is 2101002023. The reversal of 2101002021 is 1202001012.

It is not a de Polignac number, because 2101002021 - 2⁶ = 2101001957 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 2101001994 and 2101002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101002023) 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, 1314795 + ... + 1316391.

It is an arithmetic number, because the mean of its divisors is an integer number (127635456).

Almost surely, 2^2101002021 is an apocalyptic number.

It is an amenable number.

2101002021 is a deficient number, since it is larger than the sum of its proper divisors (962248923).

2101002021 is a wasteful number, since it uses less digits than its factorization.

2101002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881 (or 2878 counting only the distinct ones).

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

The square root of 2101002021 is about 45836.6885911275. The cubic root of 2101002021 is about 1280.7828099368.

Adding to 2101002021 its reverse (1202001012), we get a palindrome (3303003033).

The spelling of 2101002021 in words is "two billion, one hundred one million, two thousand, twenty-one".