221011157 has 2 divisors, whose sum is σ = 221011158. Its totient is φ = 221011156.

The previous prime is 221011123. The next prime is 221011171. The reversal of 221011157 is 751110122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116337796 + 104673361 = 10786^2 + 10231^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011157 - 2¹⁰ = 221010133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221011177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505578 + 110505579.

It is an arithmetic number, because the mean of its divisors is an integer number (110505579).

Almost surely, 2^221011157 is an apocalyptic number.

It is an amenable number.

221011157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011157 is an equidigital number, since it uses as much as digits as its factorization.

221011157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 221011157 is about 14866.4439931007. The cubic root of 221011157 is about 604.6045335768.

Adding to 221011157 its reverse (751110122), we get a palindrome (972121279).

The spelling of 221011157 in words is "two hundred twenty-one million, eleven thousand, one hundred fifty-seven".