21002100002087 has 2 divisors, whose sum is σ = 21002100002088. Its totient is φ = 21002100002086.

The previous prime is 21002100002063. The next prime is 21002100002201. The reversal of 21002100002087 is 78020000120012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002100002087 - 2²² = 21002095807783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002100002027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501050001043 + 10501050001044.

It is an arithmetic number, because the mean of its divisors is an integer number (10501050001044).

Almost surely, 2^{21002100002087} is an apocalyptic number.

21002100002087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002100002087 is an equidigital number, since it uses as much as digits as its factorization.

21002100002087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21002100002087 its reverse (78020000120012), we get a palindrome (99022100122099).

The spelling of 21002100002087 in words is "twenty-one trillion, two billion, one hundred million, two thousand, eighty-seven".