22154213 has 4 divisors (see below), whose sum is σ = 23457420. Its totient is φ = 20851008.

The previous prime is 22154203. The next prime is 22154233. The reversal of 22154213 is 31245122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10029889 + 12124324 = 3167^2 + 3482^2 .

It is a cyclic number.

It is not a de Polignac number, because 22154213 - 2²⁴ = 5376997 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 (22154203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651578 + ... + 651611.

It is an arithmetic number, because the mean of its divisors is an integer number (5864355).

Almost surely, 2^22154213 is an apocalyptic number.

It is an amenable number.

22154213 is a deficient number, since it is larger than the sum of its proper divisors (1303207).

22154213 is a wasteful number, since it uses less digits than its factorization.

22154213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303206.

The product of its digits is 480, while the sum is 20.

The square root of 22154213 is about 4706.8262130654. The cubic root of 22154213 is about 280.8571226892.

Adding to 22154213 its reverse (31245122), we get a palindrome (53399335).

Subtracting 22154213 from its reverse (31245122), we obtain a palindrome (9090909).

The spelling of 22154213 in words is "twenty-two million, one hundred fifty-four thousand, two hundred thirteen".