21147344304638 has 8 divisors (see below), whose sum is σ = 31721115938160. Its totient is φ = 10573638991920.

The previous prime is 21147344304617. The next prime is 21147344304641. The reversal of 21147344304638 is 83640344374112.

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

It is a super-2 number, since 2×21147344304638² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15775223 + ... + 17063186.

It is an arithmetic number, because the mean of its divisors is an integer number (3965139492270).

Almost surely, 2^{21147344304638} is an apocalyptic number.

21147344304638 is a deficient number, since it is larger than the sum of its proper divisors (10573771633522).

21147344304638 is a wasteful number, since it uses less digits than its factorization.

21147344304638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33160402.

The product of its (nonzero) digits is 4644864, while the sum is 50.

The spelling of 21147344304638 in words is "twenty-one trillion, one hundred forty-seven billion, three hundred forty-four million, three hundred four thousand, six hundred thirty-eight".