1157238221 has 4 divisors (see below), whose sum is σ = 1160292000. Its totient is φ = 1154184444.

The previous prime is 1157238211. The next prime is 1157238293. The reversal of 1157238221 is 1228327511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1157238221 - 2⁶ = 1157238157 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 (1157238211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526321 + ... + 1527078.

It is an arithmetic number, because the mean of its divisors is an integer number (290073000).

Almost surely, 2^1157238221 is an apocalyptic number.

It is an amenable number.

1157238221 is a deficient number, since it is larger than the sum of its proper divisors (3053779).

1157238221 is an equidigital number, since it uses as much as digits as its factorization.

1157238221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053778.

The product of its digits is 6720, while the sum is 32.

The square root of 1157238221 is about 34018.2042588964. The cubic root of 1157238221 is about 1049.8830469889.

The spelling of 1157238221 in words is "one billion, one hundred fifty-seven million, two hundred thirty-eight thousand, two hundred twenty-one".