222021987 has 16 divisors (see below), whose sum is σ = 327764352. Its totient is φ = 132549120.

The previous prime is 222021983. The next prime is 222021997. The reversal of 222021987 is 789120222.

It is not a de Polignac number, because 222021987 - 2² = 222021983 is a prime.

It is a super-2 number, since 2×222021987² = 98587525422856338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (222021983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47998 + ... + 52419.

It is an arithmetic number, because the mean of its divisors is an integer number (20485272).

Almost surely, 2^222021987 is an apocalyptic number.

222021987 is a deficient number, since it is larger than the sum of its proper divisors (105742365).

222021987 is a wasteful number, since it uses less digits than its factorization.

222021987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100498.

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

The square root of 222021987 is about 14900.4022428926. The cubic root of 222021987 is about 605.5248838352.

The spelling of 222021987 in words is "two hundred twenty-two million, twenty-one thousand, nine hundred eighty-seven".