221445902 has 8 divisors (see below), whose sum is σ = 332910000. Its totient is φ = 110475904.

The previous prime is 221445883. The next prime is 221445923. The reversal of 221445902 is 209544122.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122402 + ... + 124197.

It is an arithmetic number, because the mean of its divisors is an integer number (41613750).

Almost surely, 2^221445902 is an apocalyptic number.

221445902 is a deficient number, since it is larger than the sum of its proper divisors (111464098).

221445902 is a wasteful number, since it uses less digits than its factorization.

221445902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247050.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 221445902 is about 14881.0584972978. The cubic root of 221445902 is about 605.0007076011. Note that the first 3 decimals are identical.

The spelling of 221445902 in words is "two hundred twenty-one million, four hundred forty-five thousand, nine hundred two".