22039421 has 2 divisors, whose sum is σ = 22039422. Its totient is φ = 22039420.

The previous prime is 22039417. The next prime is 22039471. The reversal of 22039421 is 12493022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 3463321 = 4310^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 22039421 - 2² = 22039417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22039471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11019710 + 11019711.

It is an arithmetic number, because the mean of its divisors is an integer number (11019711).

Almost surely, 2^22039421 is an apocalyptic number.

It is an amenable number.

22039421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22039421 is an equidigital number, since it uses as much as digits as its factorization.

22039421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 22039421 is about 4694.6161717440. The cubic root of 22039421 is about 280.3711956142.

The spelling of 22039421 in words is "twenty-two million, thirty-nine thousand, four hundred twenty-one".