221894699 has 4 divisors (see below), whose sum is σ = 238963536. Its totient is φ = 204825864.

The previous prime is 221894681. The next prime is 221894707. The reversal of 221894699 is 996498122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 996498122 = 2 ⋅498249061.

It is a cyclic number.

It is not a de Polignac number, because 221894699 - 2⁸ = 221894443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221894599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8534399 + ... + 8534424.

It is an arithmetic number, because the mean of its divisors is an integer number (59740884).

Almost surely, 2^221894699 is an apocalyptic number.

221894699 is a deficient number, since it is larger than the sum of its proper divisors (17068837).

221894699 is a wasteful number, since it uses less digits than its factorization.

221894699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17068836.

The product of its digits is 559872, while the sum is 50.

The square root of 221894699 is about 14896.1303364330. The cubic root of 221894699 is about 605.4091433678.

The spelling of 221894699 in words is "two hundred twenty-one million, eight hundred ninety-four thousand, six hundred ninety-nine".