22021220987 has 2 divisors, whose sum is σ = 22021220988. Its totient is φ = 22021220986.

The previous prime is 22021220983. The next prime is 22021221023. The reversal of 22021220987 is 78902212022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22021220987 - 2² = 22021220983 is a prime.

It is not a weakly prime, because it can be changed into another prime (22021220981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010610493 + 11010610494.

It is an arithmetic number, because the mean of its divisors is an integer number (11010610494).

Almost surely, 2^22021220987 is an apocalyptic number.

22021220987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021220987 is an equidigital number, since it uses as much as digits as its factorization.

22021220987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 22021220987 in words is "twenty-two billion, twenty-one million, two hundred twenty thousand, nine hundred eighty-seven".