21145322 has 8 divisors (see below), whose sum is σ = 34601472. Its totient is φ = 9611500.

The previous prime is 21145307. The next prime is 21145343. The reversal of 21145322 is 22354112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21145294 and 21145303.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480554 + ... + 480597.

It is an arithmetic number, because the mean of its divisors is an integer number (4325184).

Almost surely, 2^21145322 is an apocalyptic number.

21145322 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21145322 is a deficient number, since it is larger than the sum of its proper divisors (13456150).

21145322 is a wasteful number, since it uses less digits than its factorization.

21145322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961164.

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

The square root of 21145322 is about 4598.4042884462. The cubic root of 21145322 is about 276.5273558735.

Adding to 21145322 its reverse (22354112), we get a palindrome (43499434).

The spelling of 21145322 in words is "twenty-one million, one hundred forty-five thousand, three hundred twenty-two".