21214412 has 12 divisors (see below), whose sum is σ = 39079320. Its totient is φ = 10048896.

The previous prime is 21214381. The next prime is 21214429. The reversal of 21214412 is 21441212.

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

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, 139493 + ... + 139644.

It is an arithmetic number, because the mean of its divisors is an integer number (3256610).

Almost surely, 2^21214412 is an apocalyptic number.

It is an amenable number.

21214412 is a deficient number, since it is larger than the sum of its proper divisors (17864908).

21214412 is a wasteful number, since it uses less digits than its factorization.

21214412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279160 (or 279158 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 21214412 is about 4605.9105505861. The cubic root of 21214412 is about 276.8282026294.

Adding to 21214412 its reverse (21441212), we get a palindrome (42655624).

The spelling of 21214412 in words is "twenty-one million, two hundred fourteen thousand, four hundred twelve".