21465443 has 2 divisors, whose sum is σ = 21465444. Its totient is φ = 21465442.

The previous prime is 21465397. The next prime is 21465449. The reversal of 21465443 is 34456412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21465443 - 2¹⁶ = 21399907 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21465449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732721 + 10732722.

It is an arithmetic number, because the mean of its divisors is an integer number (10732722).

Almost surely, 2^21465443 is an apocalyptic number.

21465443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21465443 is an equidigital number, since it uses as much as digits as its factorization.

21465443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 29.

The square root of 21465443 is about 4633.0813720460. The cubic root of 21465443 is about 277.9158303232.

The spelling of 21465443 in words is "twenty-one million, four hundred sixty-five thousand, four hundred forty-three".