21040031346 has 8 divisors (see below), whose sum is σ = 42080062704. Its totient is φ = 7013343780.

The previous prime is 21040031323. The next prime is 21040031393. The reversal of 21040031346 is 64313004012.

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

21040031346 is an admirable 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, 1753335940 + ... + 1753335951.

It is an arithmetic number, because the mean of its divisors is an integer number (5260007838).

Almost surely, 2^21040031346 is an apocalyptic number.

21040031346 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.

21040031346 is a wasteful number, since it uses less digits than its factorization.

21040031346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506671896.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21040031346 its reverse (64313004012), we get a palindrome (85353035358).

The spelling of 21040031346 in words is "twenty-one billion, forty million, thirty-one thousand, three hundred forty-six".