21113340499 has 2 divisors, whose sum is σ = 21113340500. Its totient is φ = 21113340498.

The previous prime is 21113340487. The next prime is 21113340509. The reversal of 21113340499 is 99404331112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113340499 - 2¹³ = 21113332307 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113340419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556670249 + 10556670250.

It is an arithmetic number, because the mean of its divisors is an integer number (10556670250).

Almost surely, 2^21113340499 is an apocalyptic number.

21113340499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113340499 is an equidigital number, since it uses as much as digits as its factorization.

21113340499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 21113340499 in words is "twenty-one billion, one hundred thirteen million, three hundred forty thousand, four hundred ninety-nine".