22145421 has 8 divisors (see below), whose sum is σ = 29798560. Its totient is φ = 14627952.

The previous prime is 22145411. The next prime is 22145429. The reversal of 22145421 is 12454122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22145421 - 2⁷ = 22145293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22145429) 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 in 7 ways as a sum of consecutive naturals, for example, 33535 + ... + 34188.

It is an arithmetic number, because the mean of its divisors is an integer number (3724820).

Almost surely, 2^22145421 is an apocalyptic number.

It is an amenable number.

22145421 is a deficient number, since it is larger than the sum of its proper divisors (7653139).

22145421 is a wasteful number, since it uses less digits than its factorization.

22145421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67835.

The product of its digits is 640, while the sum is 21.

The square root of 22145421 is about 4705.8921577104. The cubic root of 22145421 is about 280.8199646319.

Adding to 22145421 its reverse (12454122), we get a palindrome (34599543).

The spelling of 22145421 in words is "twenty-two million, one hundred forty-five thousand, four hundred twenty-one".