221151738 has 32 divisors (see below), whose sum is σ = 469935360. Its totient is φ = 69249600.

The previous prime is 221151727. The next prime is 221151743. The reversal of 221151738 is 837151122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10738 + ... + 23613.

It is an arithmetic number, because the mean of its divisors is an integer number (14685480).

Almost surely, 2^221151738 is an apocalyptic number.

221151738 is an abundant number, since it is smaller than the sum of its proper divisors (248783622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221151738 is a wasteful number, since it uses less digits than its factorization.

221151738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34422.

The product of its digits is 3360, while the sum is 30.

The square root of 221151738 is about 14871.1713728274. The cubic root of 221151738 is about 604.7326988936.

The spelling of 221151738 in words is "two hundred twenty-one million, one hundred fifty-one thousand, seven hundred thirty-eight".