221685038 has 8 divisors (see below), whose sum is σ = 340260888. Its totient is φ = 108264744.

The previous prime is 221684959. The next prime is 221685089. The reversal of 221685038 is 830586122.

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

It is a super-2 number, since 2×221685038² = 98288512146122888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221684989 and 221685007.

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, 1288781 + ... + 1288952.

It is an arithmetic number, because the mean of its divisors is an integer number (42532611).

Almost surely, 2^221685038 is an apocalyptic number.

221685038 is a deficient number, since it is larger than the sum of its proper divisors (118575850).

221685038 is a wasteful number, since it uses less digits than its factorization.

221685038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577778.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 221685038 is about 14889.0912415768. The cubic root of 221685038 is about 605.2184062216.

The spelling of 221685038 in words is "two hundred twenty-one million, six hundred eighty-five thousand, thirty-eight".