22421421 has 24 divisors (see below), whose sum is σ = 36516480. Its totient is φ = 13586760.

The previous prime is 22421411. The next prime is 22421423. The reversal of 22421421 is 12412422.

22421421 is a `hidden beast` number, since 2 + 242 + 1 + 421 = 666.

It is not a de Polignac number, because 22421421 - 2¹³ = 22413229 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22421394 and 22421403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22421423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165 + ... + 6698.

It is an arithmetic number, because the mean of its divisors is an integer number (1521520).

Almost surely, 2^22421421 is an apocalyptic number.

It is an amenable number.

22421421 is a deficient number, since it is larger than the sum of its proper divisors (14095059).

22421421 is a wasteful number, since it uses less digits than its factorization.

22421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6894 (or 6877 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 22421421 is about 4735.1262918744. The cubic root of 22421421 is about 281.9817779081.

Adding to 22421421 its reverse (12412422), we get a palindrome (34833843).

It can be divided in two parts, 2242 and 1421, that added together give a palindrome (3663).

The spelling of 22421421 in words is "twenty-two million, four hundred twenty-one thousand, four hundred twenty-one".