21821380010 has 8 divisors (see below), whose sum is σ = 39278484036. Its totient is φ = 8728552000.

The previous prime is 21821379989. The next prime is 21821380027. The reversal of 21821380010 is 1008312812.

It can be written as a sum of positive squares in 2 ways, for example, as 21667545601 + 153834409 = 147199^2 + 12403^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091068991 + ... + 1091069010.

Almost surely, 2^21821380010 is an apocalyptic number.

21821380010 is a deficient number, since it is larger than the sum of its proper divisors (17457104026).

21821380010 is a wasteful number, since it uses less digits than its factorization.

21821380010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182138008.

The product of its (nonzero) digits is 768, while the sum is 26.

Adding to 21821380010 its reverse (1008312812), we get a palindrome (22829692822).

The spelling of 21821380010 in words is "twenty-one billion, eight hundred twenty-one million, three hundred eighty thousand, ten".