22140421 has 4 divisors (see below), whose sum is σ = 23103072. Its totient is φ = 21177772.

The previous prime is 22140383. The next prime is 22140439. The reversal of 22140421 is 12404122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12404122 = 2 ⋅6202061.

It is a cyclic number.

It is not a de Polignac number, because 22140421 - 2¹¹ = 22138373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22140395 and 22140404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22140121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481291 + ... + 481336.

It is an arithmetic number, because the mean of its divisors is an integer number (5775768).

Almost surely, 2^22140421 is an apocalyptic number.

It is an amenable number.

22140421 is a deficient number, since it is larger than the sum of its proper divisors (962651).

22140421 is an equidigital number, since it uses as much as digits as its factorization.

22140421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962650.

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

The square root of 22140421 is about 4705.3608788275. The cubic root of 22140421 is about 280.7988285016.

Adding to 22140421 its reverse (12404122), we get a palindrome (34544543).

The spelling of 22140421 in words is "twenty-two million, one hundred forty thousand, four hundred twenty-one".