21066542246810 has 8 divisors (see below), whose sum is σ = 37919776044276. Its totient is φ = 8426616898720.

The previous prime is 21066542246791. The next prime is 21066542246833. The reversal of 21066542246810 is 1864224566012.

It can be written as a sum of positive squares in 2 ways, for example, as 20129965409449 + 936576837361 = 4486643^2 + 967769^2 .

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

It is a super-2 number, since 2×21066542246810² (a number of 27 digits) contains 22 as substring.

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, 1053327112331 + ... + 1053327112350.

Almost surely, 2^{21066542246810} is an apocalyptic number.

21066542246810 is a deficient number, since it is larger than the sum of its proper divisors (16853233797466).

21066542246810 is a wasteful number, since it uses less digits than its factorization.

21066542246810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106654224688.

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 21066542246810 in words is "twenty-one trillion, sixty-six billion, five hundred forty-two million, two hundred forty-six thousand, eight hundred ten".