221456899 has 2 divisors, whose sum is σ = 221456900. Its totient is φ = 221456898.

The previous prime is 221456891. The next prime is 221456927. The reversal of 221456899 is 998654122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221456899 - 2³ = 221456891 is a prime.

It is a super-2 number, since 2×221456899² = 98086316229392402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221456891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110728449 + 110728450.

It is an arithmetic number, because the mean of its divisors is an integer number (110728450).

Almost surely, 2^221456899 is an apocalyptic number.

221456899 is a deficient number, since it is larger than the sum of its proper divisors (1).

221456899 is an equidigital number, since it uses as much as digits as its factorization.

221456899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 221456899 is about 14881.4279892758. The cubic root of 221456899 is about 605.0107222105.

The spelling of 221456899 in words is "two hundred twenty-one million, four hundred fifty-six thousand, eight hundred ninety-nine".