21426545213 has 4 divisors (see below), whose sum is σ = 21437407068. Its totient is φ = 21415683360.

The previous prime is 21426545191. The next prime is 21426545237. The reversal of 21426545213 is 31254562412.

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 7361296804 + 14065248409 = 85798^2 + 118597^2 .

It is a cyclic number.

It is not a de Polignac number, because 21426545213 - 2⁸ = 21426544957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426545813) 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, 5427968 + ... + 5431913.

It is an arithmetic number, because the mean of its divisors is an integer number (5359351767).

Almost surely, 2^21426545213 is an apocalyptic number.

It is an amenable number.

21426545213 is a deficient number, since it is larger than the sum of its proper divisors (10861855).

21426545213 is a wasteful number, since it uses less digits than its factorization.

21426545213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10861854.

The product of its digits is 57600, while the sum is 35.

The spelling of 21426545213 in words is "twenty-one billion, four hundred twenty-six million, five hundred forty-five thousand, two hundred thirteen".