21040627 has 2 divisors, whose sum is σ = 21040628. Its totient is φ = 21040626.

The previous prime is 21040601. The next prime is 21040633. The reversal of 21040627 is 72604012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21040627 - 2⁷ = 21040499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21040598 and 21040607.

It is not a weakly prime, because it can be changed into another prime (21040687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520313 + 10520314.

It is an arithmetic number, because the mean of its divisors is an integer number (10520314).

Almost surely, 2^21040627 is an apocalyptic number.

21040627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040627 is an equidigital number, since it uses as much as digits as its factorization.

21040627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21040627 is about 4587.0063222106. The cubic root of 21040627 is about 276.0702186037.

Adding to 21040627 its reverse (72604012), we get a palindrome (93644639).

The spelling of 21040627 in words is "twenty-one million, forty thousand, six hundred twenty-seven".