221072494 has 8 divisors (see below), whose sum is σ = 335806560. Its totient is φ = 109136976.

The previous prime is 221072477. The next prime is 221072513. The reversal of 221072494 is 494270122.

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

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, 699439 + ... + 699754.

It is an arithmetic number, because the mean of its divisors is an integer number (41975820).

Almost surely, 2^221072494 is an apocalyptic number.

221072494 is a deficient number, since it is larger than the sum of its proper divisors (114734066).

221072494 is a wasteful number, since it uses less digits than its factorization.

221072494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399274.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 221072494 is about 14868.5067844757. The cubic root of 221072494 is about 604.6604601623.

The spelling of 221072494 in words is "two hundred twenty-one million, seventy-two thousand, four hundred ninety-four".