21947713378 has 16 divisors (see below), whose sum is σ = 33491196000. Its totient is φ = 10784110752.

The previous prime is 21947713357. The next prime is 21947713427. The reversal of 21947713378 is 87331774912.

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 7 ways as a sum of consecutive naturals, for example, 325438 + ... + 387046.

It is an arithmetic number, because the mean of its divisors is an integer number (2093199750).

Almost surely, 2^21947713378 is an apocalyptic number.

21947713378 is a deficient number, since it is larger than the sum of its proper divisors (11543482622).

21947713378 is a wasteful number, since it uses less digits than its factorization.

21947713378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64689.

The product of its digits is 1778112, while the sum is 52.

The spelling of 21947713378 in words is "twenty-one billion, nine hundred forty-seven million, seven hundred thirteen thousand, three hundred seventy-eight".