21403100987 has 2 divisors, whose sum is σ = 21403100988. Its totient is φ = 21403100986.

The previous prime is 21403100959. The next prime is 21403101001. The reversal of 21403100987 is 78900130412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21403100987 - 2⁶ = 21403100923 is a prime.

It is not a weakly prime, because it can be changed into another prime (21403100947) 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, 10701550493 + 10701550494.

It is an arithmetic number, because the mean of its divisors is an integer number (10701550494).

Almost surely, 2^21403100987 is an apocalyptic number.

21403100987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403100987 is an equidigital number, since it uses as much as digits as its factorization.

21403100987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 21403100987 in words is "twenty-one billion, four hundred three million, one hundred thousand, nine hundred eighty-seven".