21071627 has 4 divisors (see below), whose sum is σ = 22180680. Its totient is φ = 19962576.

The previous prime is 21071621. The next prime is 21071641. The reversal of 21071627 is 72617012.

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 21071627 - 2⁶ = 21071563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21071596 and 21071605.

It is not an unprimeable number, because it can be changed into a prime (21071621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554498 + ... + 554535.

It is an arithmetic number, because the mean of its divisors is an integer number (5545170).

Almost surely, 2^21071627 is an apocalyptic number.

21071627 is a deficient number, since it is larger than the sum of its proper divisors (1109053).

21071627 is a wasteful number, since it uses less digits than its factorization.

21071627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109052.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 21071627 is about 4590.3841887145. The cubic root of 21071627 is about 276.2057338489.

Adding to 21071627 its reverse (72617012), we get a palindrome (93688639).

The spelling of 21071627 in words is "twenty-one million, seventy-one thousand, six hundred twenty-seven".