21447043 has 2 divisors, whose sum is σ = 21447044. Its totient is φ = 21447042.

The previous prime is 21447011. The next prime is 21447077. The reversal of 21447043 is 34074412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21447043 - 2⁵ = 21447011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21446999 and 21447017.

It is not a weakly prime, because it can be changed into another prime (21447743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10723521 + 10723522.

It is an arithmetic number, because the mean of its divisors is an integer number (10723522).

Almost surely, 2^21447043 is an apocalyptic number.

21447043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21447043 is an equidigital number, since it uses as much as digits as its factorization.

21447043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 21447043 is about 4631.0952268335. The cubic root of 21447043 is about 277.8363985733.

The spelling of 21447043 in words is "twenty-one million, four hundred forty-seven thousand, forty-three".