21211211212 has 12 divisors (see below), whose sum is σ = 37460167360. Its totient is φ = 10508306256.

The previous prime is 21211211209. The next prime is 21211211213.

21211211212 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21211211213) 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, 24324348 + ... + 24325219.

Almost surely, 2^21211211212 is an apocalyptic number.

It is an amenable number.

21211211212 is a deficient number, since it is larger than the sum of its proper divisors (16248956148).

21211211212 is a wasteful number, since it uses less digits than its factorization.

21211211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48649680 (or 48649678 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

The spelling of 21211211212 in words is "twenty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred twelve".