1220001201987 has 16 divisors (see below), whose sum is σ = 1633629086880. Its totient is φ = 809861110272.

The previous prime is 1220001201971. The next prime is 1220001201989. The reversal of 1220001201987 is 7891021000221.

It is not a de Polignac number, because 1220001201987 - 2⁴ = 1220001201971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220001201989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261388 + ... + 1583769.

It is an arithmetic number, because the mean of its divisors is an integer number (102101817930).

Almost surely, 2^{1220001201987} is an apocalyptic number.

1220001201987 is a deficient number, since it is larger than the sum of its proper divisors (413627884893).

1220001201987 is a wasteful number, since it uses less digits than its factorization.

1220001201987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846102.

The product of its (nonzero) digits is 4032, while the sum is 33.

The spelling of 1220001201987 in words is "one trillion, two hundred twenty billion, one million, two hundred one thousand, nine hundred eighty-seven".