21371749782 has 8 divisors (see below), whose sum is σ = 42743499576. Its totient is φ = 7123916592.

The previous prime is 21371749757. The next prime is 21371749813. The reversal of 21371749782 is 28794717312.

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

21371749782 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1780979143 + ... + 1780979154.

It is an arithmetic number, because the mean of its divisors is an integer number (5342937447).

Almost surely, 2^21371749782 is an apocalyptic number.

21371749782 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.

21371749782 is a wasteful number, since it uses less digits than its factorization.

21371749782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561958302.

The product of its digits is 1185408, while the sum is 51.

The spelling of 21371749782 in words is "twenty-one billion, three hundred seventy-one million, seven hundred forty-nine thousand, seven hundred eighty-two".