2131321445 has 16 divisors (see below), whose sum is σ = 2854982592. Its totient is φ = 1514002560.

The previous prime is 2131321429. The next prime is 2131321459. The reversal of 2131321445 is 5441231312.

It is a happy number.

It is not a de Polignac number, because 2131321445 - 2⁴ = 2131321429 is a prime.

It is a super-2 number, since 2×2131321445² = 9085062203833776050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448232 + ... + 452961.

It is an arithmetic number, because the mean of its divisors is an integer number (178436412).

Almost surely, 2^2131321445 is an apocalyptic number.

It is an amenable number.

2131321445 is a deficient number, since it is larger than the sum of its proper divisors (723661147).

2131321445 is a wasteful number, since it uses less digits than its factorization.

2131321445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901252.

The product of its digits is 2880, while the sum is 26.

The square root of 2131321445 is about 46166.2370677966. The cubic root of 2131321445 is about 1286.9143736877.

Adding to 2131321445 its reverse (5441231312), we get a palindrome (7572552757).

The spelling of 2131321445 in words is "two billion, one hundred thirty-one million, three hundred twenty-one thousand, four hundred forty-five".