221949385 has 8 divisors (see below), whose sum is σ = 304387776. Its totient is φ = 152193840.

The previous prime is 221949373. The next prime is 221949401. The reversal of 221949385 is 583949122.

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

It is not a de Polignac number, because 221949385 - 2⁵ = 221949353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3170671 + ... + 3170740.

It is an arithmetic number, because the mean of its divisors is an integer number (38048472).

Almost surely, 2^221949385 is an apocalyptic number.

It is an amenable number.

221949385 is a deficient number, since it is larger than the sum of its proper divisors (82438391).

221949385 is an equidigital number, since it uses as much as digits as its factorization.

221949385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6341423.

The product of its digits is 155520, while the sum is 43.

The square root of 221949385 is about 14897.9658007394. The cubic root of 221949385 is about 605.4588736906.

The spelling of 221949385 in words is "two hundred twenty-one million, nine hundred forty-nine thousand, three hundred eighty-five".