22355421 has 16 divisors (see below), whose sum is σ = 33005568. Its totient is φ = 13345200.

The previous prime is 22355413. The next prime is 22355423. The reversal of 22355421 is 12455322.

It is not a de Polignac number, because 22355421 - 2³ = 22355413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22355391 and 22355400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22355423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2845 + ... + 7266.

It is an arithmetic number, because the mean of its divisors is an integer number (2062848).

Almost surely, 2^22355421 is an apocalyptic number.

It is an amenable number.

22355421 is a deficient number, since it is larger than the sum of its proper divisors (10650147).

22355421 is a wasteful number, since it uses less digits than its factorization.

22355421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10192.

The product of its digits is 2400, while the sum is 24.

The square root of 22355421 is about 4728.1519645629. The cubic root of 22355421 is about 281.7048241822.

Subtracting from 22355421 its reverse (12455322), we obtain a palindrome (9900099).

The spelling of 22355421 in words is "twenty-two million, three hundred fifty-five thousand, four hundred twenty-one".