21022049 has 2 divisors, whose sum is σ = 21022050. Its totient is φ = 21022048.

The previous prime is 21022021. The next prime is 21022051. The reversal of 21022049 is 94022012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20539024 + 483025 = 4532^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022049 - 2²⁴ = 4244833 is a prime.

Together with 21022051, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1331291 and since 21022049 and 1331291 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21022049.

It is not a weakly prime, because it can be changed into another prime (21022009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511024 + 10511025.

It is an arithmetic number, because the mean of its divisors is an integer number (10511025).

Almost surely, 2^21022049 is an apocalyptic number.

It is an amenable number.

21022049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022049 is an equidigital number, since it uses as much as digits as its factorization.

21022049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21022049 is about 4584.9808069391. The cubic root of 21022049 is about 275.9889418310.

The spelling of 21022049 in words is "twenty-one million, twenty-two thousand, forty-nine".