22048021 has 2 divisors, whose sum is σ = 22048022. Its totient is φ = 22048020.

The previous prime is 22048009. The next prime is 22048049. The reversal of 22048021 is 12084022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21808900 + 239121 = 4670^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 22048021 - 2¹¹ = 22045973 is a prime.

It is a super-2 number, since 2×22048021² = 972230460032882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22048021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22048001) 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, 11024010 + 11024011.

It is an arithmetic number, because the mean of its divisors is an integer number (11024011).

Almost surely, 2^22048021 is an apocalyptic number.

It is an amenable number.

22048021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22048021 is an equidigital number, since it uses as much as digits as its factorization.

22048021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 22048021 is about 4695.5320252342. The cubic root of 22048021 is about 280.4076587428.

The spelling of 22048021 in words is "twenty-two million, forty-eight thousand, twenty-one".