21821050368 has 120 divisors (see below), whose sum is σ = 67821601848. Its totient is φ = 6714150912.

The previous prime is 21821050331. The next prime is 21821050369. The reversal of 21821050368 is 86305012812.

It is a happy number.

21821050368 is a `hidden beast` number, since 2 + 1 + 82 + 10 + 503 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21821050369) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122230 + ... + 242037.

Almost surely, 2^21821050368 is an apocalyptic number.

It is an amenable number.

21821050368 is an abundant number, since it is smaller than the sum of its proper divisors (46000551480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21821050368 is a wasteful number, since it uses less digits than its factorization.

21821050368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364304 (or 364285 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 21821050368 in words is "twenty-one billion, eight hundred twenty-one million, fifty thousand, three hundred sixty-eight".