21214012 has 12 divisors (see below), whose sum is σ = 37218160. Its totient is φ = 10580256.

The previous prime is 21214003. The next prime is 21214021. The reversal of 21214012 is 21041212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21214003) and next prime (21214021).

It is a super-2 number, since 2×21214012² = 900068610272288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21213983 and 21214001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4848 + ... + 8119.

Almost surely, 2^21214012 is an apocalyptic number.

It is an amenable number.

21214012 is a deficient number, since it is larger than the sum of its proper divisors (16004148).

21214012 is a wasteful number, since it uses less digits than its factorization.

21214012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13380 (or 13378 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21214012 is about 4605.8671279141. The cubic root of 21214012 is about 276.8264627434.

Adding to 21214012 its reverse (21041212), we get a palindrome (42255224).

The spelling of 21214012 in words is "twenty-one million, two hundred fourteen thousand, twelve".