21690586403 has 2 divisors, whose sum is σ = 21690586404. Its totient is φ = 21690586402.

The previous prime is 21690586397. The next prime is 21690586441. The reversal of 21690586403 is 30468509612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21690586403 - 2⁸ = 21690586147 is a prime.

It is not a weakly prime, because it can be changed into another prime (21690586703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10845293201 + 10845293202.

It is an arithmetic number, because the mean of its divisors is an integer number (10845293202).

Almost surely, 2^21690586403 is an apocalyptic number.

21690586403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21690586403 is an equidigital number, since it uses as much as digits as its factorization.

21690586403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 21690586403 in words is "twenty-one billion, six hundred ninety million, five hundred eighty-six thousand, four hundred three".