21267212 has 12 divisors (see below), whose sum is σ = 37255680. Its totient is φ = 10622736.

The previous prime is 21267161. The next prime is 21267227. The reversal of 21267212 is 21276212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3038 + ... + 7194.

It is an arithmetic number, because the mean of its divisors is an integer number (3104640).

Almost surely, 2^21267212 is an apocalyptic number.

It is an amenable number.

21267212 is a deficient number, since it is larger than the sum of its proper divisors (15988468).

21267212 is a wasteful number, since it uses less digits than its factorization.

21267212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440 (or 5438 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 21267212 is about 4611.6387542825. The cubic root of 21267212 is about 277.0576758700.

The spelling of 21267212 in words is "twenty-one million, two hundred sixty-seven thousand, two hundred twelve".