21214277 has 8 divisors (see below), whose sum is σ = 24607296. Its totient is φ = 17911872.

The previous prime is 21214273. The next prime is 21214309. The reversal of 21214277 is 77241212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21214277 - 2² = 21214273 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22148 + ... + 23085.

It is an arithmetic number, because the mean of its divisors is an integer number (3075912).

Almost surely, 2^21214277 is an apocalyptic number.

It is an amenable number.

21214277 is a deficient number, since it is larger than the sum of its proper divisors (3393019).

21214277 is an equidigital number, since it uses as much as digits as its factorization.

21214277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45307.

The product of its digits is 1568, while the sum is 26.

The square root of 21214277 is about 4605.8958954801. The cubic root of 21214277 is about 276.8276154203.

Adding to 21214277 its reverse (77241212), we get a palindrome (98455489).

The spelling of 21214277 in words is "twenty-one million, two hundred fourteen thousand, two hundred seventy-seven".