21014970928 has 80 divisors (see below), whose sum is σ = 48245800960. Its totient is φ = 8677497600.

The previous prime is 21014970913. The next prime is 21014970929. The reversal of 21014970928 is 82907941012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21014970929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781873 + ... + 808303.

It is an arithmetic number, because the mean of its divisors is an integer number (603072512).

Almost surely, 2^21014970928 is an apocalyptic number.

21014970928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21014970928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24122900480).

21014970928 is an abundant number, since it is smaller than the sum of its proper divisors (27230830032).

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

21014970928 is a wasteful number, since it uses less digits than its factorization.

21014970928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26706 (or 26700 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 21014970928 in words is "twenty-one billion, fourteen million, nine hundred seventy thousand, nine hundred twenty-eight".