21423551860706 has 4 divisors (see below), whose sum is σ = 32135327791062. Its totient is φ = 10711775930352.

The previous prime is 21423551860679. The next prime is 21423551860717. The reversal of 21423551860706 is 60706815532412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14270949291481 + 7152602569225 = 3777691^2 + 2674435^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5355887965175 + ... + 5355887965178.

Almost surely, 2^{21423551860706} is an apocalyptic number.

21423551860706 is a deficient number, since it is larger than the sum of its proper divisors (10711775930356).

21423551860706 is a wasteful number, since it uses less digits than its factorization.

21423551860706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10711775930355.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 21423551860706 in words is "twenty-one trillion, four hundred twenty-three billion, five hundred fifty-one million, eight hundred sixty thousand, seven hundred six".