22251421 has 2 divisors, whose sum is σ = 22251422. Its totient is φ = 22251420.

The previous prime is 22251391. The next prime is 22251473. The reversal of 22251421 is 12415222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14907321 + 7344100 = 3861^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 22251421 - 2¹¹ = 22249373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22231421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11125710 + 11125711.

It is an arithmetic number, because the mean of its divisors is an integer number (11125711).

Almost surely, 2^22251421 is an apocalyptic number.

It is an amenable number.

22251421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22251421 is an equidigital number, since it uses as much as digits as its factorization.

22251421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 19.

The square root of 22251421 is about 4717.1411893222. The cubic root of 22251421 is about 281.2673038901.

Adding to 22251421 its reverse (12415222), we get a palindrome (34666643).

The spelling of 22251421 in words is "twenty-two million, two hundred fifty-one thousand, four hundred twenty-one".