21289910213 has 16 divisors (see below), whose sum is σ = 25593602496. Its totient is φ = 17450173440.

The previous prime is 21289910183. The next prime is 21289910231. The reversal of 21289910213 is 31201998212.

It is a cyclic number.

It is not a de Polignac number, because 21289910213 - 2²⁰ = 21288861637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21289910263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1725020 + ... + 1737317.

It is an arithmetic number, because the mean of its divisors is an integer number (1599600156).

Almost surely, 2^21289910213 is an apocalyptic number.

It is an amenable number.

21289910213 is a deficient number, since it is larger than the sum of its proper divisors (4303692283).

21289910213 is a wasteful number, since it uses less digits than its factorization.

21289910213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3462404.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 21289910213 in words is "twenty-one billion, two hundred eighty-nine million, nine hundred ten thousand, two hundred thirteen".