22100421 has 12 divisors (see below), whose sum is σ = 34278432. Its totient is φ = 12628728.

The previous prime is 22100347. The next prime is 22100431. The reversal of 22100421 is 12400122.

It is not a de Polignac number, because 22100421 - 2¹⁹ = 21576133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22100397 and 22100406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22100431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75025 + ... + 75318.

It is an arithmetic number, because the mean of its divisors is an integer number (2856536).

Almost surely, 2^22100421 is an apocalyptic number.

22100421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22100421 is a deficient number, since it is larger than the sum of its proper divisors (12178011).

22100421 is a wasteful number, since it uses less digits than its factorization.

22100421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150360 (or 150353 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22100421 is about 4701.1084863041. The cubic root of 22100421 is about 280.6296247934.

Adding to 22100421 its reverse (12400122), we get a palindrome (34500543).

The spelling of 22100421 in words is "twenty-two million, one hundred thousand, four hundred twenty-one".