220221987 has 8 divisors (see below), whose sum is σ = 306395904. Its totient is φ = 140431368.

The previous prime is 220221983. The next prime is 220221997. The reversal of 220221987 is 789122022.

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

It is not a de Polignac number, because 220221987 - 2² = 220221983 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (220221983) 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, 1595743 + ... + 1595880.

It is an arithmetic number, because the mean of its divisors is an integer number (38299488).

Almost surely, 2^220221987 is an apocalyptic number.

220221987 is a deficient number, since it is larger than the sum of its proper divisors (86173917).

220221987 is a wasteful number, since it uses less digits than its factorization.

220221987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191649.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 220221987 is about 14839.8782676948. The cubic root of 220221987 is about 603.8840498957.

The spelling of 220221987 in words is "two hundred twenty million, two hundred twenty-one thousand, nine hundred eighty-seven".