221086670 has 16 divisors (see below), whose sum is σ = 454807008. Its totient is φ = 75801120.

The previous prime is 221086639. The next prime is 221086703. The reversal of 221086670 is 76680122.

It is a Curzon number.

It is a congruent number.

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, 1579121 + ... + 1579260.

It is an arithmetic number, because the mean of its divisors is an integer number (28425438).

Almost surely, 2^221086670 is an apocalyptic number.

221086670 is an abundant number, since it is smaller than the sum of its proper divisors (233720338).

221086670 is a wasteful number, since it uses less digits than its factorization.

221086670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3158395.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 221086670 is about 14868.9834891293. The cubic root of 221086670 is about 604.6733842539.

The spelling of 221086670 in words is "two hundred twenty-one million, eighty-six thousand, six hundred seventy".