2151321253 has 4 divisors (see below), whose sum is σ = 2277869580. Its totient is φ = 2024772928.

The previous prime is 2151321247. The next prime is 2151321257. The reversal of 2151321253 is 3521231512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1668068964 + 483252289 = 40842^2 + 21983^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151321253 - 2²¹ = 2149224101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151321257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63274138 + ... + 63274171.

It is an arithmetic number, because the mean of its divisors is an integer number (569467395).

Almost surely, 2^2151321253 is an apocalyptic number.

It is an amenable number.

2151321253 is a deficient number, since it is larger than the sum of its proper divisors (126548327).

2151321253 is a wasteful number, since it uses less digits than its factorization.

2151321253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126548326.

The product of its digits is 1800, while the sum is 25.

The square root of 2151321253 is about 46382.3377267684. The cubic root of 2151321253 is about 1290.9272129222.

Adding to 2151321253 its reverse (3521231512), we get a palindrome (5672552765).

The spelling of 2151321253 in words is "two billion, one hundred fifty-one million, three hundred twenty-one thousand, two hundred fifty-three".