21954323 has 2 divisors, whose sum is σ = 21954324. Its totient is φ = 21954322.

The previous prime is 21954299. The next prime is 21954341. The reversal of 21954323 is 32345912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21954323 - 2¹⁰ = 21953299 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21954623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977161 + 10977162.

It is an arithmetic number, because the mean of its divisors is an integer number (10977162).

Almost surely, 2^21954323 is an apocalyptic number.

21954323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21954323 is an equidigital number, since it uses as much as digits as its factorization.

21954323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 21954323 is about 4685.5440452524. The cubic root of 21954323 is about 280.0098763523.

The spelling of 21954323 in words is "twenty-one million, nine hundred fifty-four thousand, three hundred twenty-three".