21014338920 has 64 divisors (see below), whose sum is σ = 63391386240. Its totient is φ = 5572857600.

The previous prime is 21014338909. The next prime is 21014338921. The reversal of 21014338920 is 2983341012.

It is not an unprimeable number, because it can be changed into a prime (21014338921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462036 + ... + 505475.

It is an arithmetic number, because the mean of its divisors is an integer number (990490410).

Almost surely, 2^21014338920 is an apocalyptic number.

21014338920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21014338920 is an abundant number, since it is smaller than the sum of its proper divisors (42377047320).

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

21014338920 is a wasteful number, since it uses less digits than its factorization.

21014338920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967706 (or 967702 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

Adding to 21014338920 its reverse (2983341012), we get a palindrome (23997679932).

The spelling of 21014338920 in words is "twenty-one billion, fourteen million, three hundred thirty-eight thousand, nine hundred twenty".