21214273 has 2 divisors, whose sum is σ = 21214274. Its totient is φ = 21214272.

The previous prime is 21214267. The next prime is 21214309. The reversal of 21214273 is 37241212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12588304 + 8625969 = 3548^2 + 2937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21214253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607136 + 10607137.

It is an arithmetic number, because the mean of its divisors is an integer number (10607137).

Almost surely, 2^21214273 is an apocalyptic number.

It is an amenable number.

21214273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214273 is an equidigital number, since it uses as much as digits as its factorization.

21214273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 21214273 is about 4605.8954612540. The cubic root of 21214273 is about 276.8275980215.

Adding to 21214273 its reverse (37241212), we get a palindrome (58455485).

The spelling of 21214273 in words is "twenty-one million, two hundred fourteen thousand, two hundred seventy-three".