1022021111987 has 4 divisors (see below), whose sum is σ = 1022046662400. Its totient is φ = 1021995561576.

The previous prime is 1022021111953. The next prime is 1022021112043. The reversal of 1022021111987 is 7891111202201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1022021111987 - 2⁸ = 1022021111731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1022021111687) 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, 12715112 + ... + 12795237.

It is an arithmetic number, because the mean of its divisors is an integer number (255511665600).

Almost surely, 2^{1022021111987} is an apocalyptic number.

1022021111987 is a deficient number, since it is larger than the sum of its proper divisors (25550413).

1022021111987 is an equidigital number, since it uses as much as digits as its factorization.

1022021111987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25550412.

The product of its (nonzero) digits is 4032, while the sum is 35.

The spelling of 1022021111987 in words is "one trillion, twenty-two billion, twenty-one million, one hundred eleven thousand, nine hundred eighty-seven".