21224225245 has 16 divisors (see below), whose sum is σ = 25543625472. Its totient is φ = 16929731520.

The previous prime is 21224225213. The next prime is 21224225261. The reversal of 21224225245 is 54252242212.

It is not a de Polignac number, because 21224225245 - 2⁵ = 21224225213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5276335 + ... + 5280355.

It is an arithmetic number, because the mean of its divisors is an integer number (1596476592).

Almost surely, 2^21224225245 is an apocalyptic number.

It is an amenable number.

21224225245 is a deficient number, since it is larger than the sum of its proper divisors (4319400227).

21224225245 is a wasteful number, since it uses less digits than its factorization.

21224225245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6852.

The product of its digits is 25600, while the sum is 31.

Adding to 21224225245 its reverse (54252242212), we get a palindrome (75476467457).

The spelling of 21224225245 in words is "twenty-one billion, two hundred twenty-four million, two hundred twenty-five thousand, two hundred forty-five".