21627213 has 16 divisors (see below), whose sum is σ = 31280256. Its totient is φ = 13237760.

The previous prime is 21627197. The next prime is 21627223. The reversal of 21627213 is 31272612.

It is a cyclic number.

It is not a de Polignac number, because 21627213 - 2⁴ = 21627197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21627223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3081 + ... + 7262.

It is an arithmetic number, because the mean of its divisors is an integer number (1955016).

Almost surely, 2^21627213 is an apocalyptic number.

It is an amenable number.

21627213 is a deficient number, since it is larger than the sum of its proper divisors (9653043).

21627213 is a wasteful number, since it uses less digits than its factorization.

21627213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404.

The product of its digits is 1008, while the sum is 24.

The square root of 21627213 is about 4650.5067465815. The cubic root of 21627213 is about 278.6122360807.

Adding to 21627213 its reverse (31272612), we get a palindrome (52899825).

The spelling of 21627213 in words is "twenty-one million, six hundred twenty-seven thousand, two hundred thirteen".