21262065371 has 4 divisors (see below), whose sum is σ = 21262695912. Its totient is φ = 21261434832.

The previous prime is 21262065367. The next prime is 21262065403. The reversal of 21262065371 is 17356026212.

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

It is a cyclic number.

It is not a de Polignac number, because 21262065371 - 2² = 21262065367 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21262064371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261650 + ... + 333143.

It is an arithmetic number, because the mean of its divisors is an integer number (5315673978).

Almost surely, 2^21262065371 is an apocalyptic number.

21262065371 is a deficient number, since it is larger than the sum of its proper divisors (630541).

21262065371 is an equidigital number, since it uses as much as digits as its factorization.

21262065371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630540.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 21262065371 in words is "twenty-one billion, two hundred sixty-two million, sixty-five thousand, three hundred seventy-one".