21270203113 has 4 divisors (see below), whose sum is σ = 21345898068. Its totient is φ = 21194508160.

The previous prime is 21270203057. The next prime is 21270203147. The reversal of 21270203113 is 31130207212.

It is a happy number.

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 10535585449 + 10734617664 = 102643^2 + 103608^2 .

It is a cyclic number.

It is not a de Polignac number, because 21270203113 - 2⁹ = 21270202601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21270200113) 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, 37847056 + ... + 37847617.

It is an arithmetic number, because the mean of its divisors is an integer number (5336474517).

Almost surely, 2^21270203113 is an apocalyptic number.

It is an amenable number.

21270203113 is a deficient number, since it is larger than the sum of its proper divisors (75694955).

21270203113 is an equidigital number, since it uses as much as digits as its factorization.

21270203113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75694954.

The product of its (nonzero) digits is 504, while the sum is 22.

The spelling of 21270203113 in words is "twenty-one billion, two hundred seventy million, two hundred three thousand, one hundred thirteen".