20227421 has 2 divisors, whose sum is σ = 20227422. Its totient is φ = 20227420.

The previous prime is 20227411. The next prime is 20227439. The reversal of 20227421 is 12472202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 2292196 = 4235^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 20227421 - 2⁶ = 20227357 is a prime.

It is a super-2 number, since 2×20227421² = 818297120622482, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20227393 and 20227402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20227411) 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, 10113710 + 10113711.

It is an arithmetic number, because the mean of its divisors is an integer number (10113711).

Almost surely, 2^20227421 is an apocalyptic number.

It is an amenable number.

20227421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20227421 is an equidigital number, since it uses as much as digits as its factorization.

20227421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20227421 is about 4497.4905225025. The cubic root of 20227421 is about 272.4667456544.

Adding to 20227421 its reverse (12472202), we get a palindrome (32699623).

The spelling of 20227421 in words is "twenty million, two hundred twenty-seven thousand, four hundred twenty-one".