21072283 has 2 divisors, whose sum is σ = 21072284. Its totient is φ = 21072282.

The previous prime is 21072257. The next prime is 21072307. The reversal of 21072283 is 38227012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21072283 - 2⁵ = 21072251 is a prime.

It is a super-2 number, since 2×21072283² = 888082221664178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21072683) 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, 10536141 + 10536142.

It is an arithmetic number, because the mean of its divisors is an integer number (10536142).

Almost surely, 2^21072283 is an apocalyptic number.

21072283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21072283 is an equidigital number, since it uses as much as digits as its factorization.

21072283 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21072283 is about 4590.4556418726. The cubic root of 21072283 is about 276.2086000898.

Adding to 21072283 its reverse (38227012), we get a palindrome (59299295).

The spelling of 21072283 in words is "twenty-one million, seventy-two thousand, two hundred eighty-three".