22109987 has 2 divisors, whose sum is σ = 22109988. Its totient is φ = 22109986.

The previous prime is 22109981. The next prime is 22109993. The reversal of 22109987 is 78990122.

It is a balanced prime because it is at equal distance from previous prime (22109981) and next prime (22109993).

It is a cyclic number.

It is not a de Polignac number, because 22109987 - 2¹² = 22105891 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22109987.

It is not a weakly prime, because it can be changed into another prime (22109981) 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 as a sum of consecutive naturals, namely, 11054993 + 11054994.

It is an arithmetic number, because the mean of its divisors is an integer number (11054994).

Almost surely, 2^22109987 is an apocalyptic number.

22109987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22109987 is an equidigital number, since it uses as much as digits as its factorization.

22109987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 22109987 is about 4702.1257958502. The cubic root of 22109987 is about 280.6701084228.

The spelling of 22109987 in words is "twenty-two million, one hundred nine thousand, nine hundred eighty-seven".