221115254651 has 2 divisors, whose sum is σ = 221115254652. Its totient is φ = 221115254650.

The previous prime is 221115254609. The next prime is 221115254671. The reversal of 221115254651 is 156452511122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221115254651 - 2¹⁸ = 221114992507 is a prime.

It is not a weakly prime, because it can be changed into another prime (221115254671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110557627325 + 110557627326.

It is an arithmetic number, because the mean of its divisors is an integer number (110557627326).

Almost surely, 2^221115254651 is an apocalyptic number.

221115254651 is a deficient number, since it is larger than the sum of its proper divisors (1).

221115254651 is an equidigital number, since it uses as much as digits as its factorization.

221115254651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 35.

Adding to 221115254651 its reverse (156452511122), we get a palindrome (377567765773).

The spelling of 221115254651 in words is "two hundred twenty-one billion, one hundred fifteen million, two hundred fifty-four thousand, six hundred fifty-one".