221054340251 has 2 divisors, whose sum is σ = 221054340252. Its totient is φ = 221054340250.

The previous prime is 221054340203. The next prime is 221054340257. The reversal of 221054340251 is 152043450122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221054340251 - 2¹⁰ = 221054339227 is a prime.

It is not a weakly prime, because it can be changed into another prime (221054340257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110527170125 + 110527170126.

It is an arithmetic number, because the mean of its divisors is an integer number (110527170126).

Almost surely, 2^221054340251 is an apocalyptic number.

221054340251 is a deficient number, since it is larger than the sum of its proper divisors (1).

221054340251 is an equidigital number, since it uses as much as digits as its factorization.

221054340251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 221054340251 its reverse (152043450122), we get a palindrome (373097790373).

The spelling of 221054340251 in words is "two hundred twenty-one billion, fifty-four million, three hundred forty thousand, two hundred fifty-one".