22412821 has 2 divisors, whose sum is σ = 22412822. Its totient is φ = 22412820.

The previous prime is 22412813. The next prime is 22412827. The reversal of 22412821 is 12821422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21622500 + 790321 = 4650^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 22412821 - 2³ = 22412813 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22412792 and 22412801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22412827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11206410 + 11206411.

It is an arithmetic number, because the mean of its divisors is an integer number (11206411).

Almost surely, 2^22412821 is an apocalyptic number.

It is an amenable number.

22412821 is a deficient number, since it is larger than the sum of its proper divisors (1).

22412821 is an equidigital number, since it uses as much as digits as its factorization.

22412821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 22.

The square root of 22412821 is about 4734.2180980601. The cubic root of 22412821 is about 281.9457208208.

The spelling of 22412821 in words is "twenty-two million, four hundred twelve thousand, eight hundred twenty-one".