21123627 has 16 divisors (see below), whose sum is σ = 32797440. Its totient is φ = 11842272.

The previous prime is 21123607. The next prime is 21123631. The reversal of 21123627 is 72632112.

It is not a de Polignac number, because 21123627 - 2¹⁰ = 21122603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21123597 and 21123606.

It is not an unprimeable number, because it can be changed into a prime (21123607) 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, 8377 + ... + 10602.

It is an arithmetic number, because the mean of its divisors is an integer number (2049840).

Almost surely, 2^21123627 is an apocalyptic number.

21123627 is a deficient number, since it is larger than the sum of its proper divisors (11673813).

21123627 is a wasteful number, since it uses less digits than its factorization.

21123627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19042.

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

The square root of 21123627 is about 4596.0447125762. The cubic root of 21123627 is about 276.4327515934.

Adding to 21123627 its reverse (72632112), we get a palindrome (93755739).

The spelling of 21123627 in words is "twenty-one million, one hundred twenty-three thousand, six hundred twenty-seven".