22219987 has 4 divisors (see below), whose sum is σ = 23389480. Its totient is φ = 21050496.

The previous prime is 22219979. The next prime is 22219993. The reversal of 22219987 is 78991222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78991222 = 2 ⋅39495611.

It is a cyclic number.

It is not a de Polignac number, because 22219987 - 2³ = 22219979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22219907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584718 + ... + 584755.

It is an arithmetic number, because the mean of its divisors is an integer number (5847370).

Almost surely, 2^22219987 is an apocalyptic number.

22219987 is a deficient number, since it is larger than the sum of its proper divisors (1169493).

22219987 is a wasteful number, since it uses less digits than its factorization.

22219987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169492.

The product of its digits is 36288, while the sum is 40.

The square root of 22219987 is about 4713.8081208297. The cubic root of 22219987 is about 281.1347951540.

The spelling of 22219987 in words is "twenty-two million, two hundred nineteen thousand, nine hundred eighty-seven".