221211234430157 has 2 divisors, whose sum is σ = 221211234430158. Its totient is φ = 221211234430156.

The previous prime is 221211234430103. The next prime is 221211234430177. The reversal of 221211234430157 is 751034432112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154719914313316 + 66491320116841 = 12438646^2 + 8154221^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211234430157 - 2²⁶ = 221211167321293 is a prime.

It is a super-2 number, since 2×221211234430157² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221211234430157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211234430177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605617215078 + 110605617215079.

It is an arithmetic number, because the mean of its divisors is an integer number (110605617215079).

Almost surely, 2^{221211234430157} is an apocalyptic number.

It is an amenable number.

221211234430157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211234430157 is an equidigital number, since it uses as much as digits as its factorization.

221211234430157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 221211234430157 its reverse (751034432112122), we get a palindrome (972245666542279).

The spelling of 221211234430157 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred thirty-four million, four hundred thirty thousand, one hundred fifty-seven".