21234034399 has 4 divisors (see below), whose sum is σ = 22483095264. Its totient is φ = 19984973536.

The previous prime is 21234034363. The next prime is 21234034441. The reversal of 21234034399 is 99343043212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21234034399 - 2⁷ = 21234034271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234034499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624530407 + ... + 624530440.

It is an arithmetic number, because the mean of its divisors is an integer number (5620773816).

Almost surely, 2^21234034399 is an apocalyptic number.

21234034399 is a deficient number, since it is larger than the sum of its proper divisors (1249060865).

21234034399 is a wasteful number, since it uses less digits than its factorization.

21234034399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249060864.

The product of its (nonzero) digits is 139968, while the sum is 40.

The spelling of 21234034399 in words is "twenty-one billion, two hundred thirty-four million, thirty-four thousand, three hundred ninety-nine".