21336450820 has 24 divisors (see below), whose sum is σ = 45018908928. Its totient is φ = 8494130400.

The previous prime is 21336450803. The next prime is 21336450847. The reversal of 21336450820 is 2805463312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2523796 + ... + 2532235.

It is an arithmetic number, because the mean of its divisors is an integer number (1875787872).

Almost surely, 2^21336450820 is an apocalyptic number.

21336450820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21336450820 is an abundant number, since it is smaller than the sum of its proper divisors (23682458108).

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

21336450820 is a wasteful number, since it uses less digits than its factorization.

21336450820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056251 (or 5056249 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 21336450820 in words is "twenty-one billion, three hundred thirty-six million, four hundred fifty thousand, eight hundred twenty".