21032209987 has 2 divisors, whose sum is σ = 21032209988. Its totient is φ = 21032209986.

The previous prime is 21032209973. The next prime is 21032210027. The reversal of 21032209987 is 78990223012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21032209987 - 2⁷ = 21032209859 is a prime.

It is not a weakly prime, because it can be changed into another prime (21032509987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516104993 + 10516104994.

It is an arithmetic number, because the mean of its divisors is an integer number (10516104994).

Almost surely, 2^21032209987 is an apocalyptic number.

21032209987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032209987 is an equidigital number, since it uses as much as digits as its factorization.

21032209987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 21032209987 in words is "twenty-one billion, thirty-two million, two hundred nine thousand, nine hundred eighty-seven".