21380440699 has 2 divisors, whose sum is σ = 21380440700. Its totient is φ = 21380440698.

The previous prime is 21380440691. The next prime is 21380440727. The reversal of 21380440699 is 99604408312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21380440699 - 2³ = 21380440691 is a prime.

It is not a weakly prime, because it can be changed into another prime (21380440691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10690220349 + 10690220350.

It is an arithmetic number, because the mean of its divisors is an integer number (10690220350).

Almost surely, 2^21380440699 is an apocalyptic number.

21380440699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21380440699 is an equidigital number, since it uses as much as digits as its factorization.

21380440699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 21380440699 in words is "twenty-one billion, three hundred eighty million, four hundred forty thousand, six hundred ninety-nine".