221011221157 has 2 divisors, whose sum is σ = 221011221158. Its totient is φ = 221011221156.

The previous prime is 221011221073. The next prime is 221011221191. The reversal of 221011221157 is 751122110122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183480295716 + 37530925441 = 428346^2 + 193729^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011221157 - 2¹⁵ = 221011188389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221011225157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505610578 + 110505610579.

It is an arithmetic number, because the mean of its divisors is an integer number (110505610579).

Almost surely, 2^221011221157 is an apocalyptic number.

It is an amenable number.

221011221157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011221157 is an equidigital number, since it uses as much as digits as its factorization.

221011221157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 221011221157 its reverse (751122110122), we get a palindrome (972133331279).

The spelling of 221011221157 in words is "two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, one hundred fifty-seven".