7257958221 has 32 divisors (see below), whose sum is σ = 10219507200. Its totient is φ = 4576283136.

The previous prime is 7257958207. The next prime is 7257958243. The reversal of 7257958221 is 1228597527.

It is not a de Polignac number, because 7257958221 - 2²⁶ = 7190849357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7257957221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 772665 + ... + 782001.

It is an arithmetic number, because the mean of its divisors is an integer number (319359600).

Almost surely, 2^7257958221 is an apocalyptic number.

It is an amenable number.

7257958221 is a deficient number, since it is larger than the sum of its proper divisors (2961548979).

7257958221 is a wasteful number, since it uses less digits than its factorization.

7257958221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9573.

The product of its digits is 705600, while the sum is 48.

The square root of 7257958221 is about 85193.6512951523. The cubic root of 7257958221 is about 1936.1462289835.

The spelling of 7257958221 in words is "seven billion, two hundred fifty-seven million, nine hundred fifty-eight thousand, two hundred twenty-one".