21056527 has 2 divisors, whose sum is σ = 21056528. Its totient is φ = 21056526.

The previous prime is 21056507. The next prime is 21056537. The reversal of 21056527 is 72565012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21056527 - 2¹⁵ = 21023759 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21056495 and 21056504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21056507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10528263 + 10528264.

It is an arithmetic number, because the mean of its divisors is an integer number (10528264).

Almost surely, 2^21056527 is an apocalyptic number.

21056527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21056527 is an equidigital number, since it uses as much as digits as its factorization.

21056527 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21056527 is about 4588.7391514445. The cubic root of 21056527 is about 276.1397414250.

The spelling of 21056527 in words is "twenty-one million, fifty-six thousand, five hundred twenty-seven".