221021100020087 has 2 divisors, whose sum is σ = 221021100020088. Its totient is φ = 221021100020086.

The previous prime is 221021100019987. The next prime is 221021100020143. The reversal of 221021100020087 is 780020001120122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221021100020087 - 2²⁴ = 221021083242871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021100020887) 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 as a sum of consecutive naturals, namely, 110510550010043 + 110510550010044.

It is an arithmetic number, because the mean of its divisors is an integer number (110510550010044).

Almost surely, 2^{221021100020087} is an apocalyptic number.

221021100020087 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021100020087 is an equidigital number, since it uses as much as digits as its factorization.

221021100020087 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.

The spelling of 221021100020087 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred million, twenty thousand, eighty-seven".