21946983544 has 32 divisors (see below), whose sum is σ = 45073681200. Its totient is φ = 9971852800.

The previous prime is 21946983533. The next prime is 21946983577. The reversal of 21946983544 is 44538964912.

It is a super-4 number, since 4×21946983544⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

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, 2778382 + ... + 2786269.

Almost surely, 2^21946983544 is an apocalyptic number.

It is an amenable number.

21946983544 is an abundant number, since it is smaller than the sum of its proper divisors (23126697656).

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

21946983544 is a wasteful number, since it uses less digits than its factorization.

21946983544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5564703 (or 5564699 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 55.

The spelling of 21946983544 in words is "twenty-one billion, nine hundred forty-six million, nine hundred eighty-three thousand, five hundred forty-four".