221022987 has 8 divisors (see below), whose sum is σ = 294929040. Its totient is φ = 147232800.

The previous prime is 221022983. The next prime is 221023003. The reversal of 221022987 is 789220122.

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

It is not a de Polignac number, because 221022987 - 2² = 221022983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221022983) 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, 24412 + ... + 32217.

It is an arithmetic number, because the mean of its divisors is an integer number (36866130).

Almost surely, 2^221022987 is an apocalyptic number.

221022987 is a deficient number, since it is larger than the sum of its proper divisors (73906053).

221022987 is a wasteful number, since it uses less digits than its factorization.

221022987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57933.

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

The square root of 221022987 is about 14866.8418636912. The cubic root of 221022987 is about 604.6153208814.

The spelling of 221022987 in words is "two hundred twenty-one million, twenty-two thousand, nine hundred eighty-seven".