21271105106 has 8 divisors (see below), whose sum is σ = 31907369340. Its totient is φ = 10635315328.

The previous prime is 21271105099. The next prime is 21271105133. The reversal of 21271105106 is 60150117212.

It can be written as a sum of positive squares in 2 ways, for example, as 19803525625 + 1467579481 = 140725^2 + 38309^2 .

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

It is a Curzon 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, 31430 + ... + 208638.

Almost surely, 2^21271105106 is an apocalyptic number.

21271105106 is a deficient number, since it is larger than the sum of its proper divisors (10636264234).

21271105106 is a wasteful number, since it uses less digits than its factorization.

21271105106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237228.

The product of its (nonzero) digits is 840, while the sum is 26.

The spelling of 21271105106 in words is "twenty-one billion, two hundred seventy-one million, one hundred five thousand, one hundred six".