221451157 has 2 divisors, whose sum is σ = 221451158. Its totient is φ = 221451156.

The previous prime is 221451151. The next prime is 221451211. The reversal of 221451157 is 751154122.

221451157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158105476 + 63345681 = 12574^2 + 7959^2 .

It is a cyclic number.

It is not a de Polignac number, because 221451157 - 2³ = 221451149 is a prime.

It is a super-2 number, since 2×221451157² = 98081229873277298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221451151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110725578 + 110725579.

It is an arithmetic number, because the mean of its divisors is an integer number (110725579).

Almost surely, 2^221451157 is an apocalyptic number.

It is an amenable number.

221451157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221451157 is an equidigital number, since it uses as much as digits as its factorization.

221451157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2800, while the sum is 28.

The square root of 221451157 is about 14881.2350629912. The cubic root of 221451157 is about 605.0054931997.

The spelling of 221451157 in words is "two hundred twenty-one million, four hundred fifty-one thousand, one hundred fifty-seven".