221100111157 has 2 divisors, whose sum is σ = 221100111158. Its totient is φ = 221100111156.

The previous prime is 221100111097. The next prime is 221100111179. The reversal of 221100111157 is 751111001122.

It is an a-pointer prime, because the next prime (221100111179) can be obtained adding 221100111157 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193007334276 + 28092776881 = 439326^2 + 167609^2 .

It is a cyclic number.

It is not a de Polignac number, because 221100111157 - 2²³ = 221091722549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221100112157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550055578 + 110550055579.

It is an arithmetic number, because the mean of its divisors is an integer number (110550055579).

Almost surely, 2^221100111157 is an apocalyptic number.

It is an amenable number.

221100111157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221100111157 is an equidigital number, since it uses as much as digits as its factorization.

221100111157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 22.

Adding to 221100111157 its reverse (751111001122), we get a palindrome (972211112279).

The spelling of 221100111157 in words is "two hundred twenty-one billion, one hundred million, one hundred eleven thousand, one hundred fifty-seven".