21575327 has 2 divisors, whose sum is σ = 21575328. Its totient is φ = 21575326.

The previous prime is 21575251. The next prime is 21575339. The reversal of 21575327 is 72357512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21575327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21575293 and 21575302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21575347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10787663 + 10787664.

It is an arithmetic number, because the mean of its divisors is an integer number (10787664).

Almost surely, 2^21575327 is an apocalyptic number.

21575327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21575327 is an equidigital number, since it uses as much as digits as its factorization.

21575327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14700, while the sum is 32.

The square root of 21575327 is about 4644.9248648390. The cubic root of 21575327 is about 278.3892508002.

The spelling of 21575327 in words is "twenty-one million, five hundred seventy-five thousand, three hundred twenty-seven".