21532943 has 2 divisors, whose sum is σ = 21532944. Its totient is φ = 21532942.

The previous prime is 21532937. The next prime is 21532949. The reversal of 21532943 is 34923512.

It is a balanced prime because it is at equal distance from previous prime (21532937) and next prime (21532949).

It is a cyclic number.

It is not a de Polignac number, because 21532943 - 2¹² = 21528847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21532949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766471 + 10766472.

It is an arithmetic number, because the mean of its divisors is an integer number (10766472).

Almost surely, 2^21532943 is an apocalyptic number.

21532943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21532943 is an equidigital number, since it uses as much as digits as its factorization.

21532943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 21532943 is about 4640.3602230861. The cubic root of 21532943 is about 278.2068358769.

The spelling of 21532943 in words is "twenty-one million, five hundred thirty-two thousand, nine hundred forty-three".