21245627 has 4 divisors (see below), whose sum is σ = 22879920. Its totient is φ = 19611336.

The previous prime is 21245617. The next prime is 21245669. The reversal of 21245627 is 72654212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21245627 - 2¹² = 21241531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21245627.

It is not an unprimeable number, because it can be changed into a prime (21245617) by changing a digit.

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, 817127 + ... + 817152.

It is an arithmetic number, because the mean of its divisors is an integer number (5719980).

Almost surely, 2^21245627 is an apocalyptic number.

21245627 is a deficient number, since it is larger than the sum of its proper divisors (1634293).

21245627 is a wasteful number, since it uses less digits than its factorization.

21245627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634292.

The product of its digits is 6720, while the sum is 29.

The square root of 21245627 is about 4609.2978857956. The cubic root of 21245627 is about 276.9639115926.

Adding to 21245627 its reverse (72654212), we get a palindrome (93899839).

The spelling of 21245627 in words is "twenty-one million, two hundred forty-five thousand, six hundred twenty-seven".