22122421 has 2 divisors, whose sum is σ = 22122422. Its totient is φ = 22122420.

The previous prime is 22122413. The next prime is 22122427. The reversal of 22122421 is 12422122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14062500 + 8059921 = 3750^2 + 2839^2 .

It is a cyclic number.

It is not a de Polignac number, because 22122421 - 2³ = 22122413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22122395 and 22122404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22122427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11061210 + 11061211.

It is an arithmetic number, because the mean of its divisors is an integer number (11061211).

Almost surely, 2^22122421 is an apocalyptic number.

It is an amenable number.

22122421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22122421 is an equidigital number, since it uses as much as digits as its factorization.

22122421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 16.

The square root of 22122421 is about 4703.4477779603. The cubic root of 22122421 is about 280.7227120740.

Adding to 22122421 its reverse (12422122), we get a palindrome (34544543).

The spelling of 22122421 in words is "twenty-two million, one hundred twenty-two thousand, four hundred twenty-one".