221151983 has 8 divisors (see below), whose sum is σ = 238584528. Its totient is φ = 203779584.

The previous prime is 221151977. The next prime is 221152013. The reversal of 221151983 is 389151122.

It is a happy number.

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 221151983 - 2⁸ = 221151727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221151913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7241 + ... + 22242.

It is an arithmetic number, because the mean of its divisors is an integer number (29823066).

Almost surely, 2^221151983 is an apocalyptic number.

221151983 is a deficient number, since it is larger than the sum of its proper divisors (17432545).

221151983 is a wasteful number, since it uses less digits than its factorization.

221151983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30073.

The product of its digits is 4320, while the sum is 32.

The square root of 221151983 is about 14871.1796102394. The cubic root of 221151983 is about 604.7329222085.

The spelling of 221151983 in words is "two hundred twenty-one million, one hundred fifty-one thousand, nine hundred eighty-three".