21311211229 has 16 divisors (see below), whose sum is σ = 26577233280. Its totient is φ = 16601506560.

The previous prime is 21311211221. The next prime is 21311211239. The reversal of 21311211229 is 92211211312.

It is a cyclic number.

It is not a de Polignac number, because 21311211229 - 2³ = 21311211221 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 (21311211221) 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, 253497 + ... + 326929.

It is an arithmetic number, because the mean of its divisors is an integer number (1661077080).

Almost surely, 2^21311211229 is an apocalyptic number.

It is an amenable number.

21311211229 is a deficient number, since it is larger than the sum of its proper divisors (5266022051).

21311211229 is a wasteful number, since it uses less digits than its factorization.

21311211229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77220.

The product of its digits is 432, while the sum is 25.

The spelling of 21311211229 in words is "twenty-one billion, three hundred eleven million, two hundred eleven thousand, two hundred twenty-nine".