21214067 has 4 divisors (see below), whose sum is σ = 24244656. Its totient is φ = 18183480.

The previous prime is 21214049. The next prime is 21214087. The reversal of 21214067 is 76041212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21214067 - 2⁶ = 21214003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214087) 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, 1515284 + ... + 1515297.

It is an arithmetic number, because the mean of its divisors is an integer number (6061164).

Almost surely, 2^21214067 is an apocalyptic number.

21214067 is a deficient number, since it is larger than the sum of its proper divisors (3030589).

21214067 is an equidigital number, since it uses as much as digits as its factorization.

21214067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030588.

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

The square root of 21214067 is about 4605.8730985558. The cubic root of 21214067 is about 276.8267019790.

Adding to 21214067 its reverse (76041212), we get a palindrome (97255279).

The spelling of 21214067 in words is "twenty-one million, two hundred fourteen thousand, sixty-seven".