21946739584 has 128 divisors (see below), whose sum is σ = 54584524800. Its totient is φ = 8539084800.

The previous prime is 21946739537. The next prime is 21946739623. The reversal of 21946739584 is 48593764912.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12604954 + ... + 12606694.

It is an arithmetic number, because the mean of its divisors is an integer number (426441600).

Almost surely, 2^21946739584 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21946739584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27292262400).

21946739584 is an abundant number, since it is smaller than the sum of its proper divisors (32637785216).

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

21946739584 is a wasteful number, since it uses less digits than its factorization.

21946739584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052 (or 3040 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 58.

The spelling of 21946739584 in words is "twenty-one billion, nine hundred forty-six million, seven hundred thirty-nine thousand, five hundred eighty-four".