22071921 has 4 divisors (see below), whose sum is σ = 29429232. Its totient is φ = 14714612.

The previous prime is 22071919. The next prime is 22071937. The reversal of 22071921 is 12917022.

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.

It is a cyclic number.

It is not a de Polignac number, because 22071921 - 2¹ = 22071919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22071891 and 22071900.

It is not an unprimeable number, because it can be changed into a prime (22071121) 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, 3678651 + ... + 3678656.

It is an arithmetic number, because the mean of its divisors is an integer number (7357308).

Almost surely, 2^22071921 is an apocalyptic number.

It is an amenable number.

22071921 is a deficient number, since it is larger than the sum of its proper divisors (7357311).

22071921 is an equidigital number, since it uses as much as digits as its factorization.

22071921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7357310.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 22071921 is about 4698.0763084480. The cubic root of 22071921 is about 280.5089425563.

Adding to 22071921 its reverse (12917022), we get a palindrome (34988943).

The spelling of 22071921 in words is "twenty-two million, seventy-one thousand, nine hundred twenty-one".