21271033445 has 4 divisors (see below), whose sum is σ = 25525240140. Its totient is φ = 17016826752.

The previous prime is 21271033429. The next prime is 21271033447. The reversal of 21271033445 is 54433017212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14465113441 + 6805920004 = 120271^2 + 82498^2 .

It is a cyclic number.

It is not a de Polignac number, because 21271033445 - 2⁴ = 21271033429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271033447) 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, 2127103340 + ... + 2127103349.

It is an arithmetic number, because the mean of its divisors is an integer number (6381310035).

Almost surely, 2^21271033445 is an apocalyptic number.

It is an amenable number.

21271033445 is a deficient number, since it is larger than the sum of its proper divisors (4254206695).

21271033445 is an equidigital number, since it uses as much as digits as its factorization.

21271033445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254206694.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 21271033445 in words is "twenty-one billion, two hundred seventy-one million, thirty-three thousand, four hundred forty-five".