21469571 has 2 divisors, whose sum is σ = 21469572. Its totient is φ = 21469570.

The previous prime is 21469543. The next prime is 21469573. The reversal of 21469571 is 17596412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21469571 - 2²² = 17275267 is a prime.

Together with 21469573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21469573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734785 + 10734786.

It is an arithmetic number, because the mean of its divisors is an integer number (10734786).

Almost surely, 2^21469571 is an apocalyptic number.

21469571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21469571 is an equidigital number, since it uses as much as digits as its factorization.

21469571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 21469571 is about 4633.5268424819. The cubic root of 21469571 is about 277.9336444289.

The spelling of 21469571 in words is "twenty-one million, four hundred sixty-nine thousand, five hundred seventy-one".