221382831 has 8 divisors (see below), whose sum is σ = 301457664. Its totient is φ = 144448280.

The previous prime is 221382817. The next prime is 221382907. The reversal of 221382831 is 138283122.

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 221382831 - 2⁶ = 221382767 is a prime.

It is a super-2 number, since 2×221382831² = 98020715723149122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221382131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 784905 + ... + 785186.

It is an arithmetic number, because the mean of its divisors is an integer number (37682208).

Almost surely, 2^221382831 is an apocalyptic number.

221382831 is a deficient number, since it is larger than the sum of its proper divisors (80074833).

221382831 is a wasteful number, since it uses less digits than its factorization.

221382831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570141.

The product of its digits is 4608, while the sum is 30.

The square root of 221382831 is about 14878.9391758956. The cubic root of 221382831 is about 604.9432644927.

The spelling of 221382831 in words is "two hundred twenty-one million, three hundred eighty-two thousand, eight hundred thirty-one".