2101031021 has 4 divisors (see below), whose sum is σ = 2101129344. Its totient is φ = 2100932700.

The previous prime is 2101030999. The next prime is 2101031027. The reversal of 2101031021 is 1201301012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2101031021 - 2²² = 2096836717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101030993 and 2101031011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101031027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2075 + ... + 64856.

It is an arithmetic number, because the mean of its divisors is an integer number (525282336).

Almost surely, 2^2101031021 is an apocalyptic number.

It is an amenable number.

2101031021 is a deficient number, since it is larger than the sum of its proper divisors (98323).

2101031021 is an equidigital number, since it uses as much as digits as its factorization.

2101031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98322.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 2101031021 is about 45837.0049305144. The cubic root of 2101031021 is about 1280.7887027648.

Adding to 2101031021 its reverse (1201301012), we get a palindrome (3302332033).

The spelling of 2101031021 in words is "two billion, one hundred one million, thirty-one thousand, twenty-one".