22220221987 has 2 divisors, whose sum is σ = 22220221988. Its totient is φ = 22220221986.

The previous prime is 22220221967. The next prime is 22220222009. The reversal of 22220221987 is 78912202222.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22220221987 - 2²³ = 22211833379 is a prime.

It is not a weakly prime, because it can be changed into another prime (22220221927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110110993 + 11110110994.

It is an arithmetic number, because the mean of its divisors is an integer number (11110110994).

Almost surely, 2^22220221987 is an apocalyptic number.

22220221987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22220221987 is an equidigital number, since it uses as much as digits as its factorization.

22220221987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 22220221987 in words is "twenty-two billion, two hundred twenty million, two hundred twenty-one thousand, nine hundred eighty-seven".