1220221001987 has 24 divisors (see below), whose sum is σ = 1334717447616. Its totient is φ = 1108941660288.

The previous prime is 1220221001977. The next prime is 1220221002043. The reversal of 1220221001987 is 7891001220221.

It is not a de Polignac number, because 1220221001987 - 2²² = 1220216807683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220221001977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134041478 + ... + 134050580.

It is an arithmetic number, because the mean of its divisors is an integer number (55613226984).

Almost surely, 2^{1220221001987} is an apocalyptic number.

1220221001987 is a deficient number, since it is larger than the sum of its proper divisors (114496445629).

1220221001987 is an equidigital number, since it uses as much as digits as its factorization.

1220221001987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11547 (or 11480 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 1220221001987 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one thousand, nine hundred eighty-seven".