21904212826 has 8 divisors (see below), whose sum is σ = 32864003424. Its totient is φ = 10949545020.

The previous prime is 21904212823. The next prime is 21904212881. The reversal of 21904212826 is 62821240912.

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

It is not an unprimeable number, because it can be changed into a prime (21904212823) 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, 1269990 + ... + 1287121.

It is an arithmetic number, because the mean of its divisors is an integer number (4108000428).

Almost surely, 2^21904212826 is an apocalyptic number.

21904212826 is a deficient number, since it is larger than the sum of its proper divisors (10959790598).

21904212826 is a wasteful number, since it uses less digits than its factorization.

21904212826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561396.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 21904212826 in words is "twenty-one billion, nine hundred four million, two hundred twelve thousand, eight hundred twenty-six".