221115043451 has 2 divisors, whose sum is σ = 221115043452. Its totient is φ = 221115043450.

The previous prime is 221115043427. The next prime is 221115043469. The reversal of 221115043451 is 154340511122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221115043451 is a prime.

It is not a weakly prime, because it can be changed into another prime (221115043651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110557521725 + 110557521726.

It is an arithmetic number, because the mean of its divisors is an integer number (110557521726).

Almost surely, 2^221115043451 is an apocalyptic number.

221115043451 is a deficient number, since it is larger than the sum of its proper divisors (1).

221115043451 is an equidigital number, since it uses as much as digits as its factorization.

221115043451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 221115043451 its reverse (154340511122), we get a palindrome (375455554573).

The spelling of 221115043451 in words is "two hundred twenty-one billion, one hundred fifteen million, forty-three thousand, four hundred fifty-one".