21200102011987 has 2 divisors, whose sum is σ = 21200102011988. Its totient is φ = 21200102011986.

The previous prime is 21200102011873. The next prime is 21200102011999. The reversal of 21200102011987 is 78911020100212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200102011987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200102015987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600051005993 + 10600051005994.

It is an arithmetic number, because the mean of its divisors is an integer number (10600051005994).

Almost surely, 2^{21200102011987} is an apocalyptic number.

21200102011987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200102011987 is an equidigital number, since it uses as much as digits as its factorization.

21200102011987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 21200102011987 in words is "twenty-one trillion, two hundred billion, one hundred two million, eleven thousand, nine hundred eighty-seven".