221694694 has 8 divisors (see below), whose sum is σ = 358122240. Its totient is φ = 102320616.

The previous prime is 221694689. The next prime is 221694703. The reversal of 221694694 is 496496122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221694694.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4263334 + ... + 4263385.

It is an arithmetic number, because the mean of its divisors is an integer number (44765280).

Almost surely, 2^221694694 is an apocalyptic number.

221694694 is a deficient number, since it is larger than the sum of its proper divisors (136427546).

221694694 is a wasteful number, since it uses less digits than its factorization.

221694694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8526734.

The product of its digits is 186624, while the sum is 43.

The square root of 221694694 is about 14889.4155022956. The cubic root of 221694694 is about 605.2271933190.

The spelling of 221694694 in words is "two hundred twenty-one million, six hundred ninety-four thousand, six hundred ninety-four".