21732943 has 2 divisors, whose sum is σ = 21732944. Its totient is φ = 21732942.

The previous prime is 21732917. The next prime is 21732983. The reversal of 21732943 is 34923712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21732943 - 2¹³ = 21724751 is a prime.

It is a super-2 number, since 2×21732943² = 944641622882498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21732913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10866471 + 10866472.

It is an arithmetic number, because the mean of its divisors is an integer number (10866472).

Almost surely, 2^21732943 is an apocalyptic number.

21732943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21732943 is an equidigital number, since it uses as much as digits as its factorization.

21732943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 21732943 is about 4661.8604655223. The cubic root of 21732943 is about 279.0655199128.

The spelling of 21732943 in words is "twenty-one million, seven hundred thirty-two thousand, nine hundred forty-three".