21232969 has 2 divisors, whose sum is σ = 21232970. Its totient is φ = 21232968.

The previous prime is 21232963. The next prime is 21232987. The reversal of 21232969 is 96923212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15303744 + 5929225 = 3912^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232969 - 2⁹ = 21232457 is a prime.

It is a super-2 number, since 2×21232969² = 901677945109922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (21232963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616484 + 10616485.

It is an arithmetic number, because the mean of its divisors is an integer number (10616485).

Almost surely, 2^21232969 is an apocalyptic number.

It is an amenable number.

21232969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232969 is an equidigital number, since it uses as much as digits as its factorization.

21232969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 21232969 is about 4607.9245870565. The cubic root of 21232969 is about 276.9088962606.

It can be divided in two parts, 21232 and 969, that added together give a square (22201 = 149²).

The spelling of 21232969 in words is "twenty-one million, two hundred thirty-two thousand, nine hundred sixty-nine".