2131021 has 8 divisors (see below), whose sum is σ = 2282400. Its totient is φ = 1983600.

The previous prime is 2131013. The next prime is 2131039. The reversal of 2131021 is 1201312.

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

It is not a de Polignac number, because 2131021 - 2³ = 2131013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2130989 and 2131007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (285300).

2^2131021 is an apocalyptic number.

It is an amenable number.

2131021 is a deficient number, since it is larger than the sum of its proper divisors (151379).

2131021 is a wasteful number, since it uses less digits than its factorization.

2131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979.

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

The square root of 2131021 is about 1459.8016988619. The cubic root of 2131021 is about 128.6853900226.

Adding to 2131021 its reverse (1201312), we get a palindrome (3332333).

The spelling of 2131021 in words is "two million, one hundred thirty-one thousand, twenty-one".