21464227 has 2 divisors, whose sum is σ = 21464228. Its totient is φ = 21464226.

The previous prime is 21464213. The next prime is 21464239. The reversal of 21464227 is 72246412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21464227 - 2¹⁹ = 20939939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21464195 and 21464204.

It is not a weakly prime, because it can be changed into another prime (21464207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732113 + 10732114.

It is an arithmetic number, because the mean of its divisors is an integer number (10732114).

Almost surely, 2^21464227 is an apocalyptic number.

21464227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464227 is an equidigital number, since it uses as much as digits as its factorization.

21464227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 28.

The square root of 21464227 is about 4632.9501400296. The cubic root of 21464227 is about 277.9105823217.

The spelling of 21464227 in words is "twenty-one million, four hundred sixty-four thousand, two hundred twenty-seven".