21202005439 has 8 divisors (see below), whose sum is σ = 21539203712. Its totient is φ = 20867333400.

The previous prime is 21202005427. The next prime is 21202005443. The reversal of 21202005439 is 93450020212.

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

It is a cyclic number.

It is not a de Polignac number, because 21202005439 - 2⁹ = 21202004927 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 (21202005499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614637 + ... + 648214.

It is an arithmetic number, because the mean of its divisors is an integer number (2692400464).

Almost surely, 2^21202005439 is an apocalyptic number.

21202005439 is a deficient number, since it is larger than the sum of its proper divisors (337198273).

21202005439 is a wasteful number, since it uses less digits than its factorization.

21202005439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263117.

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 21202005439 in words is "twenty-one billion, two hundred two million, five thousand, four hundred thirty-nine".