21269527 has 2 divisors, whose sum is σ = 21269528. Its totient is φ = 21269526.

The previous prime is 21269471. The next prime is 21269537. The reversal of 21269527 is 72596212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21269527 - 2¹⁹ = 20745239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21269492 and 21269501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21269537) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10634763 + 10634764.

It is an arithmetic number, because the mean of its divisors is an integer number (10634764).

Almost surely, 2^21269527 is an apocalyptic number.

21269527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21269527 is an equidigital number, since it uses as much as digits as its factorization.

21269527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 21269527 is about 4611.8897428278. The cubic root of 21269527 is about 277.0677283590.

The spelling of 21269527 in words is "twenty-one million, two hundred sixty-nine thousand, five hundred twenty-seven".