21532967 has 2 divisors, whose sum is σ = 21532968. Its totient is φ = 21532966.

The previous prime is 21532961. The next prime is 21532969. The reversal of 21532967 is 76923512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21532967 - 2¹⁶ = 21467431 is a prime.

Together with 21532969, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21532961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766483 + 10766484.

It is an arithmetic number, because the mean of its divisors is an integer number (10766484).

Almost surely, 2^21532967 is an apocalyptic number.

21532967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21532967 is an equidigital number, since it uses as much as digits as its factorization.

21532967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 21532967 is about 4640.3628090915. The cubic root of 21532967 is about 278.2069392373.

The spelling of 21532967 in words is "twenty-one million, five hundred thirty-two thousand, nine hundred sixty-seven".