21821435774 has 8 divisors (see below), whose sum is σ = 33146484960. Its totient is φ = 10772607456.

The previous prime is 21821435767. The next prime is 21821435789. The reversal of 21821435774 is 47753412812.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69055019 + ... + 69055334.

It is an arithmetic number, because the mean of its divisors is an integer number (4143310620).

Almost surely, 2^21821435774 is an apocalyptic number.

21821435774 is a deficient number, since it is larger than the sum of its proper divisors (11325049186).

21821435774 is a wasteful number, since it uses less digits than its factorization.

21821435774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138110434.

The product of its digits is 376320, while the sum is 44.

The spelling of 21821435774 in words is "twenty-one billion, eight hundred twenty-one million, four hundred thirty-five thousand, seven hundred seventy-four".