21012002020187 has 2 divisors, whose sum is σ = 21012002020188. Its totient is φ = 21012002020186.

The previous prime is 21012002020183. The next prime is 21012002020201. The reversal of 21012002020187 is 78102020021012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012002020187 - 2² = 21012002020183 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012002020183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506001010093 + 10506001010094.

It is an arithmetic number, because the mean of its divisors is an integer number (10506001010094).

Almost surely, 2^{21012002020187} is an apocalyptic number.

21012002020187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012002020187 is an equidigital number, since it uses as much as digits as its factorization.

21012002020187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 21012002020187 its reverse (78102020021012), we get a palindrome (99114022041199).

The spelling of 21012002020187 in words is "twenty-one trillion, twelve billion, two million, twenty thousand, one hundred eighty-seven".