2145135321 has 24 divisors (see below), whose sum is σ = 3727555520. Its totient is φ = 1161275616.

The previous prime is 2145135299. The next prime is 2145135323. The reversal of 2145135321 is 1235315412.

It is not a de Polignac number, because 2145135321 - 2⁹ = 2145134809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145135323) 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, 894850 + ... + 897243.

Almost surely, 2^2145135321 is an apocalyptic number.

2145135321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2145135321 is a deficient number, since it is larger than the sum of its proper divisors (1582420199).

2145135321 is a wasteful number, since it uses less digits than its factorization.

2145135321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792125 (or 1792122 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 2145135321 is about 46315.6055881816. The cubic root of 2145135321 is about 1289.6887098173.

The spelling of 2145135321 in words is "two billion, one hundred forty-five million, one hundred thirty-five thousand, three hundred twenty-one".