2251557321 has 8 divisors (see below), whose sum is σ = 3233005440. Its totient is φ = 1385573712.

The previous prime is 2251557281. The next prime is 2251557349. The reversal of 2251557321 is 1237551522.

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

It is not a de Polignac number, because 2251557321 - 2¹³ = 2251549129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2251557221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28866081 + ... + 28866158.

It is an arithmetic number, because the mean of its divisors is an integer number (404125680).

Almost surely, 2^2251557321 is an apocalyptic number.

It is an amenable number.

2251557321 is a deficient number, since it is larger than the sum of its proper divisors (981448119).

2251557321 is a wasteful number, since it uses less digits than its factorization.

2251557321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57732255.

The product of its digits is 21000, while the sum is 33.

The square root of 2251557321 is about 47450.5776677165. The cubic root of 2251557321 is about 1310.6729485377.

The spelling of 2251557321 in words is "two billion, two hundred fifty-one million, five hundred fifty-seven thousand, three hundred twenty-one".