21468259 has 2 divisors, whose sum is σ = 21468260. Its totient is φ = 21468258.

The previous prime is 21468253. The next prime is 21468277. The reversal of 21468259 is 95286412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21468259 - 2¹³ = 21460067 is a prime.

It is a super-2 number, since 2×21468259² = 921772288982162, which contains 22 as substring.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (21468253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734129 + 10734130.

It is an arithmetic number, because the mean of its divisors is an integer number (10734130).

Almost surely, 2^21468259 is an apocalyptic number.

21468259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21468259 is an equidigital number, since it uses as much as digits as its factorization.

21468259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 21468259 is about 4633.3852634980. The cubic root of 21468259 is about 277.9279828289.

The spelling of 21468259 in words is "twenty-one million, four hundred sixty-eight thousand, two hundred fifty-nine".