21010425439 has 8 divisors (see below), whose sum is σ = 21256976000. Its totient is φ = 20764693656.

The previous prime is 21010425419. The next prime is 21010425479. The reversal of 21010425439 is 93452401012.

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 21010425439 - 2⁹ = 21010424927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010425439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010425419) 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, 152997 + ... + 255790.

It is an arithmetic number, because the mean of its divisors is an integer number (2657122000).

Almost surely, 2^21010425439 is an apocalyptic number.

21010425439 is a deficient number, since it is larger than the sum of its proper divisors (246550561).

21010425439 is a wasteful number, since it uses less digits than its factorization.

21010425439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409389.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21010425439 in words is "twenty-one billion, ten million, four hundred twenty-five thousand, four hundred thirty-nine".