21146404105 has 8 divisors (see below), whose sum is σ = 25386019200. Its totient is φ = 16910233776.

The previous prime is 21146404087. The next prime is 21146404133. The reversal of 21146404105 is 50140464112.

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

It is a cyclic number.

It is not a de Polignac number, because 21146404105 - 2¹³ = 21146395913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 847665 + ... + 872254.

It is an arithmetic number, because the mean of its divisors is an integer number (3173252400).

Almost surely, 2^21146404105 is an apocalyptic number.

It is an amenable number.

21146404105 is a deficient number, since it is larger than the sum of its proper divisors (4239615095).

21146404105 is a wasteful number, since it uses less digits than its factorization.

21146404105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722383.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 21146404105 its reverse (50140464112), we get a palindrome (71286868217).

The spelling of 21146404105 in words is "twenty-one billion, one hundred forty-six million, four hundred four thousand, one hundred five".