21339699 has 8 divisors (see below), whose sum is σ = 29690112. Its totient is φ = 13607880.

The previous prime is 21339677. The next prime is 21339733. The reversal of 21339699 is 99693312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21339699 - 2¹⁶ = 21274163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21339699.

It is not an unprimeable number, because it can be changed into a prime (21339629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154567 + ... + 154704.

It is an arithmetic number, because the mean of its divisors is an integer number (3711264).

Almost surely, 2^21339699 is an apocalyptic number.

21339699 is a deficient number, since it is larger than the sum of its proper divisors (8350413).

21339699 is a wasteful number, since it uses less digits than its factorization.

21339699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309297.

The product of its digits is 78732, while the sum is 42.

The square root of 21339699 is about 4619.4912057498. The cubic root of 21339699 is about 277.3720926641.

The spelling of 21339699 in words is "twenty-one million, three hundred thirty-nine thousand, six hundred ninety-nine".