221694874 has 4 divisors (see below), whose sum is σ = 332542314. Its totient is φ = 110847436.

The previous prime is 221694871. The next prime is 221694877. The reversal of 221694874 is 478496122.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (221694871) and next prime (221694877).

It can be written as a sum of positive squares in only one way, i.e., 133240849 + 88454025 = 11543^2 + 9405^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221694874.

It is not an unprimeable number, because it can be changed into a prime (221694871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55423717 + ... + 55423720.

Almost surely, 2^221694874 is an apocalyptic number.

221694874 is a deficient number, since it is larger than the sum of its proper divisors (110847440).

221694874 is a wasteful number, since it uses less digits than its factorization.

221694874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110847439.

The product of its digits is 193536, while the sum is 43.

The square root of 221694874 is about 14889.4215468567. The cubic root of 221694874 is about 605.2273571192.

The spelling of 221694874 in words is "two hundred twenty-one million, six hundred ninety-four thousand, eight hundred seventy-four".