2001221939887 has 2 divisors, whose sum is σ = 2001221939888. Its totient is φ = 2001221939886.

The previous prime is 2001221939881. The next prime is 2001221939923. The reversal of 2001221939887 is 7889391221002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001221939887 - 2³ = 2001221939879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001221939881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610969943 + 1000610969944.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610969944).

Almost surely, 2^{2001221939887} is an apocalyptic number.

2001221939887 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001221939887 is an equidigital number, since it uses as much as digits as its factorization.

2001221939887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 2001221939887 in words is "two trillion, one billion, two hundred twenty-one million, nine hundred thirty-nine thousand, eight hundred eighty-seven".