221031982 has 8 divisors (see below), whose sum is σ = 332268552. Its totient is φ = 110275800.

The previous prime is 221031973. The next prime is 221031983. The reversal of 221031982 is 289130122.

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

It is a super-3 number, since 3×221031982³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221031982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221031983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118944 + ... + 120787.

It is an arithmetic number, because the mean of its divisors is an integer number (41533569).

Almost surely, 2^221031982 is an apocalyptic number.

221031982 is a deficient number, since it is larger than the sum of its proper divisors (111236570).

221031982 is a wasteful number, since it uses less digits than its factorization.

221031982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240194.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 221031982 is about 14867.1443794698. The cubic root of 221031982 is about 604.6235228051.

The spelling of 221031982 in words is "two hundred twenty-one million, thirty-one thousand, nine hundred eighty-two".