21312214 has 48 divisors (see below), whose sum is σ = 41981184. Its totient is φ = 7927920.

The previous prime is 21312173. The next prime is 21312223. The reversal of 21312214 is 41221312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38689 + ... + 39235.

It is an arithmetic number, because the mean of its divisors is an integer number (874608).

Almost surely, 2^21312214 is an apocalyptic number.

21312214 is a deficient number, since it is larger than the sum of its proper divisors (20668970).

21312214 is a wasteful number, since it uses less digits than its factorization.

21312214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 590 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21312214 is about 4616.5153525143. The cubic root of 21312214 is about 277.2529587235.

Adding to 21312214 its reverse (41221312), we get a palindrome (62533526).

The spelling of 21312214 in words is "twenty-one million, three hundred twelve thousand, two hundred fourteen".