21759393342 has 8 divisors (see below), whose sum is σ = 43518786696. Its totient is φ = 7253131112.

The previous prime is 21759393319. The next prime is 21759393347. The reversal of 21759393342 is 24339395712.

It is a sphenic number, since it is the product of 3 distinct primes.

21759393342 is an admirable number.

It is a super-2 number, since 2×21759393342² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21759393291 and 21759393300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21759393347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813282773 + ... + 1813282784.

It is an arithmetic number, because the mean of its divisors is an integer number (5439848337).

Almost surely, 2^21759393342 is an apocalyptic number.

21759393342 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21759393342 is a wasteful number, since it uses less digits than its factorization.

21759393342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626565562.

The product of its digits is 1224720, while the sum is 48.

The spelling of 21759393342 in words is "twenty-one billion, seven hundred fifty-nine million, three hundred ninety-three thousand, three hundred forty-two".