21242433399 has 16 divisors (see below), whose sum is σ = 30989786880. Its totient is φ = 12835992960.

The previous prime is 21242433391. The next prime is 21242433463. The reversal of 21242433399 is 99333424212.

It is not a de Polignac number, because 21242433399 - 2³ = 21242433391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21242433399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242433391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943939 + ... + 966180.

It is an arithmetic number, because the mean of its divisors is an integer number (1936861680).

Almost surely, 2^21242433399 is an apocalyptic number.

21242433399 is a deficient number, since it is larger than the sum of its proper divisors (9747353481).

21242433399 is a wasteful number, since it uses less digits than its factorization.

21242433399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910470.

The product of its digits is 279936, while the sum is 42.

The spelling of 21242433399 in words is "twenty-one billion, two hundred forty-two million, four hundred thirty-three thousand, three hundred ninety-nine".