221672755 has 8 divisors (see below), whose sum is σ = 268448400. Its totient is φ = 175710816.

The previous prime is 221672729. The next prime is 221672761. The reversal of 221672755 is 557276122.

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

It is a cyclic number.

It is not a de Polignac number, because 221672755 - 2¹³ = 221664563 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, 202825 + ... + 203914.

It is an arithmetic number, because the mean of its divisors is an integer number (33556050).

Almost surely, 2^221672755 is an apocalyptic number.

221672755 is a deficient number, since it is larger than the sum of its proper divisors (46775645).

221672755 is a wasteful number, since it uses less digits than its factorization.

221672755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406853.

The product of its digits is 58800, while the sum is 37.

The square root of 221672755 is about 14888.6787526630. The cubic root of 221672755 is about 605.2072281480.

The spelling of 221672755 in words is "two hundred twenty-one million, six hundred seventy-two thousand, seven hundred fifty-five".