21394800213 has 4 divisors (see below), whose sum is σ = 28526400288. Its totient is φ = 14263200140.

The previous prime is 21394800139. The next prime is 21394800233. The reversal of 21394800213 is 31200849312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21394800213 - 2¹⁰ = 21394799189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21394800233) 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, 3565800033 + ... + 3565800038.

It is an arithmetic number, because the mean of its divisors is an integer number (7131600072).

Almost surely, 2^21394800213 is an apocalyptic number.

It is an amenable number.

21394800213 is a deficient number, since it is larger than the sum of its proper divisors (7131600075).

21394800213 is an equidigital number, since it uses as much as digits as its factorization.

21394800213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7131600074.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 21394800213 in words is "twenty-one billion, three hundred ninety-four million, eight hundred thousand, two hundred thirteen".