2131322021 has 4 divisors (see below), whose sum is σ = 2132176032. Its totient is φ = 2130468012.

The previous prime is 2131322003. The next prime is 2131322069. The reversal of 2131322021 is 1202231312.

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.

It is a cyclic number.

It is not a de Polignac number, because 2131322021 - 2¹⁴ = 2131305637 is a prime.

It is a super-4 number, since 4×2131322021⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131312021) 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, 423251 + ... + 428256.

It is an arithmetic number, because the mean of its divisors is an integer number (533044008).

Almost surely, 2^2131322021 is an apocalyptic number.

It is an amenable number.

2131322021 is a deficient number, since it is larger than the sum of its proper divisors (854011).

2131322021 is an equidigital number, since it uses as much as digits as its factorization.

2131322021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854010.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2131322021 is about 46166.2433061214. The cubic root of 2131322021 is about 1286.9144896193.

Adding to 2131322021 its reverse (1202231312), we get a palindrome (3333553333).

It can be divided in two parts, 21313 and 22021, that added together give a palindrome (43334).

The spelling of 2131322021 in words is "two billion, one hundred thirty-one million, three hundred twenty-two thousand, twenty-one".