221749790 has 8 divisors (see below), whose sum is σ = 399149640. Its totient is φ = 88699912.

The previous prime is 221749763. The next prime is 221749811. The reversal of 221749790 is 97947122.

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, 11087480 + ... + 11087499.

It is an arithmetic number, because the mean of its divisors is an integer number (49893705).

Almost surely, 2^221749790 is an apocalyptic number.

221749790 is a deficient number, since it is larger than the sum of its proper divisors (177399850).

221749790 is a wasteful number, since it uses less digits than its factorization.

221749790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22174986.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 221749790 is about 14891.2655607238. The cubic root of 221749790 is about 605.2773265824.

The spelling of 221749790 in words is "two hundred twenty-one million, seven hundred forty-nine thousand, seven hundred ninety".