221124157 has 2 divisors, whose sum is σ = 221124158. Its totient is φ = 221124156.

The previous prime is 221124133. The next prime is 221124161. The reversal of 221124157 is 751421122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188622756 + 32501401 = 13734^2 + 5701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221124157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221124107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110562078 + 110562079.

It is an arithmetic number, because the mean of its divisors is an integer number (110562079).

Almost surely, 2^221124157 is an apocalyptic number.

It is an amenable number.

221124157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221124157 is an equidigital number, since it uses as much as digits as its factorization.

221124157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 221124157 is about 14870.2440127928. The cubic root of 221124157 is about 604.7075580466.

Adding to 221124157 its reverse (751421122), we get a palindrome (972545279).

The spelling of 221124157 in words is "two hundred twenty-one million, one hundred twenty-four thousand, one hundred fifty-seven".