22216987 has 16 divisors (see below), whose sum is σ = 25562880. Its totient is φ = 19152000.

The previous prime is 22216967. The next prime is 22217009. The reversal of 22216987 is 78961222.

It is a cyclic number.

It is not a de Polignac number, because 22216987 - 2²³ = 13828379 is a prime.

It is a super-2 number, since 2×22216987² = 987189022716338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22216927) 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, 10737 + ... + 12637.

It is an arithmetic number, because the mean of its divisors is an integer number (1597680).

Almost surely, 2^22216987 is an apocalyptic number.

22216987 is a deficient number, since it is larger than the sum of its proper divisors (3345893).

22216987 is a wasteful number, since it uses less digits than its factorization.

22216987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974.

The product of its digits is 24192, while the sum is 37.

The square root of 22216987 is about 4713.4898960325. The cubic root of 22216987 is about 281.1221422461.

The spelling of 22216987 in words is "twenty-two million, two hundred sixteen thousand, nine hundred eighty-seven".