221021100001087 has 2 divisors, whose sum is σ = 221021100001088. Its totient is φ = 221021100001086.

The previous prime is 221021100001007. The next prime is 221021100001111. The reversal of 221021100001087 is 780100001120122.

It is a happy number.

221021100001087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221021100001087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021100001007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510550000543 + 110510550000544.

It is an arithmetic number, because the mean of its divisors is an integer number (110510550000544).

Almost surely, 2^{221021100001087} is an apocalyptic number.

221021100001087 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021100001087 is an equidigital number, since it uses as much as digits as its factorization.

221021100001087 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 25.

The spelling of 221021100001087 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred million, one thousand, eighty-seven".