221434044451 has 2 divisors, whose sum is σ = 221434044452. Its totient is φ = 221434044450.

The previous prime is 221434044439. The next prime is 221434044487. The reversal of 221434044451 is 154440434122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221434044451 - 2²⁵ = 221400490019 is a prime.

It is not a weakly prime, because it can be changed into another prime (221434044401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110717022225 + 110717022226.

It is an arithmetic number, because the mean of its divisors is an integer number (110717022226).

Almost surely, 2^221434044451 is an apocalyptic number.

221434044451 is a deficient number, since it is larger than the sum of its proper divisors (1).

221434044451 is an equidigital number, since it uses as much as digits as its factorization.

221434044451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 34.

Adding to 221434044451 its reverse (154440434122), we get a palindrome (375874478573).

The spelling of 221434044451 in words is "two hundred twenty-one billion, four hundred thirty-four million, forty-four thousand, four hundred fifty-one".