21424967 has 2 divisors, whose sum is σ = 21424968. Its totient is φ = 21424966.

The previous prime is 21424957. The next prime is 21424973. The reversal of 21424967 is 76942412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21424967 - 2¹⁶ = 21359431 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21424957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712483 + 10712484.

It is an arithmetic number, because the mean of its divisors is an integer number (10712484).

Almost surely, 2^21424967 is an apocalyptic number.

21424967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424967 is an equidigital number, since it uses as much as digits as its factorization.

21424967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 21424967 is about 4628.7111597074. The cubic root of 21424967 is about 277.7410377660.

The spelling of 21424967 in words is "twenty-one million, four hundred twenty-four thousand, nine hundred sixty-seven".