21031627 has 2 divisors, whose sum is σ = 21031628. Its totient is φ = 21031626.

The previous prime is 21031559. The next prime is 21031639. The reversal of 21031627 is 72613012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031627 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21031598 and 21031607.

It is not a weakly prime, because it can be changed into another prime (21031667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515813 + 10515814.

It is an arithmetic number, because the mean of its divisors is an integer number (10515814).

Almost surely, 2^21031627 is an apocalyptic number.

21031627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031627 is an equidigital number, since it uses as much as digits as its factorization.

21031627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21031627 is about 4586.0251852776. The cubic root of 21031627 is about 276.0308505387.

Adding to 21031627 its reverse (72613012), we get a palindrome (93644639).

The spelling of 21031627 in words is "twenty-one million, thirty-one thousand, six hundred twenty-seven".