21438283 has 2 divisors, whose sum is σ = 21438284. Its totient is φ = 21438282.

The previous prime is 21438257. The next prime is 21438301. The reversal of 21438283 is 38283412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21438283 - 2¹³ = 21430091 is a prime.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (21438253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10719141 + 10719142.

It is an arithmetic number, because the mean of its divisors is an integer number (10719142).

Almost surely, 2^21438283 is an apocalyptic number.

21438283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21438283 is an equidigital number, since it uses as much as digits as its factorization.

21438283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

The square root of 21438283 is about 4630.1493496431. The cubic root of 21438283 is about 277.7985661894.

The spelling of 21438283 in words is "twenty-one million, four hundred thirty-eight thousand, two hundred eighty-three".