21947474912 has 96 divisors (see below), whose sum is σ = 49968957024. Its totient is φ = 9378201600.

The previous prime is 21947474909. The next prime is 21947474971.

21947474912 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

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, 6897962 + ... + 6901142.

It is an arithmetic number, because the mean of its divisors is an integer number (520509969).

Almost surely, 2^21947474912 is an apocalyptic number.

21947474912 is a gapful number since it is divisible by the number (22) 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 21947474912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24984478512).

21947474912 is an abundant number, since it is smaller than the sum of its proper divisors (28021482112).

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

21947474912 is a wasteful number, since it uses less digits than its factorization.

21947474912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372 (or 4364 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 50.

The spelling of 21947474912 in words is "twenty-one billion, nine hundred forty-seven million, four hundred seventy-four thousand, nine hundred twelve".