21947565532 has 12 divisors (see below), whose sum is σ = 40429726120. Its totient is φ = 10396215216.

The previous prime is 21947565503. The next prime is 21947565571. The reversal of 21947565532 is 23556574912.

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 3 ways as a sum of consecutive naturals, for example, 144391803 + ... + 144391954.

Almost surely, 2^21947565532 is an apocalyptic number.

It is an amenable number.

21947565532 is a deficient number, since it is larger than the sum of its proper divisors (18482160588).

21947565532 is a wasteful number, since it uses less digits than its factorization.

21947565532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288783780 (or 288783778 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 49.

The spelling of 21947565532 in words is "twenty-one billion, nine hundred forty-seven million, five hundred sixty-five thousand, five hundred thirty-two".