21240532699 has 2 divisors, whose sum is σ = 21240532700. Its totient is φ = 21240532698.

The previous prime is 21240532697. The next prime is 21240532723. The reversal of 21240532699 is 99623504212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21240532699 - 2¹ = 21240532697 is a prime.

Together with 21240532697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21240532697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620266349 + 10620266350.

It is an arithmetic number, because the mean of its divisors is an integer number (10620266350).

Almost surely, 2^21240532699 is an apocalyptic number.

21240532699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240532699 is an equidigital number, since it uses as much as digits as its factorization.

21240532699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 21240532699 in words is "twenty-one billion, two hundred forty million, five hundred thirty-two thousand, six hundred ninety-nine".