21391733762 has 16 divisors (see below), whose sum is σ = 36673691712. Its totient is φ = 9167348880.

The previous prime is 21391733749. The next prime is 21391733773. The reversal of 21391733762 is 26733719312.

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, 288212 + ... + 354752.

It is an arithmetic number, because the mean of its divisors is an integer number (2292105732).

Almost surely, 2^21391733762 is an apocalyptic number.

21391733762 is a deficient number, since it is larger than the sum of its proper divisors (15281957950).

21391733762 is a wasteful number, since it uses less digits than its factorization.

21391733762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89513.

The product of its digits is 285768, while the sum is 44.

The spelling of 21391733762 in words is "twenty-one billion, three hundred ninety-one million, seven hundred thirty-three thousand, seven hundred sixty-two".