21120283 has 2 divisors, whose sum is σ = 21120284. Its totient is φ = 21120282.

The previous prime is 21120277. The next prime is 21120311. The reversal of 21120283 is 38202112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120283 - 2⁵ = 21120251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120283.

It is not a weakly prime, because it can be changed into another prime (21120223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560141 + 10560142.

It is an arithmetic number, because the mean of its divisors is an integer number (10560142).

Almost surely, 2^21120283 is an apocalyptic number.

21120283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120283 is an equidigital number, since it uses as much as digits as its factorization.

21120283 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21120283 is about 4595.6809071127. The cubic root of 21120283 is about 276.4181638223.

Adding to 21120283 its reverse (38202112), we get a palindrome (59322395).

The spelling of 21120283 in words is "twenty-one million, one hundred twenty thousand, two hundred eighty-three".