21270527 has 2 divisors, whose sum is σ = 21270528. Its totient is φ = 21270526.

The previous prime is 21270511. The next prime is 21270533. The reversal of 21270527 is 72507212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21270527 - 2⁴ = 21270511 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21270496 and 21270505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21270547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10635263 + 10635264.

It is an arithmetic number, because the mean of its divisors is an integer number (10635264).

Almost surely, 2^21270527 is an apocalyptic number.

21270527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21270527 is an equidigital number, since it uses as much as digits as its factorization.

21270527 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21270527 is about 4611.9981569814. The cubic root of 21270527 is about 277.0720704613.

Adding to 21270527 its reverse (72507212), we get a palindrome (93777739).

The spelling of 21270527 in words is "twenty-one million, two hundred seventy thousand, five hundred twenty-seven".