21004331342 has 8 divisors (see below), whose sum is σ = 31569135696. Its totient is φ = 10481286112.

The previous prime is 21004331333. The next prime is 21004331353. The reversal of 21004331342 is 24313340012.

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

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, 10438523 + ... + 10440534.

It is an arithmetic number, because the mean of its divisors is an integer number (3946141962).

Almost surely, 2^21004331342 is an apocalyptic number.

21004331342 is a deficient number, since it is larger than the sum of its proper divisors (10564804354).

21004331342 is a wasteful number, since it uses less digits than its factorization.

21004331342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20879562.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21004331342 its reverse (24313340012), we get a palindrome (45317671354).

The spelling of 21004331342 in words is "twenty-one billion, four million, three hundred thirty-one thousand, three hundred forty-two".