21004442122 has 8 divisors (see below), whose sum is σ = 32876518176. Its totient is φ = 10045602732.

The previous prime is 21004442113. The next prime is 21004442131. The reversal of 21004442122 is 22124440012.

It is an interprime number because it is at equal distance from previous prime (21004442113) and next prime (21004442131).

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 = 21004442093 and 21004442102.

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, 228309108 + ... + 228309199.

It is an arithmetic number, because the mean of its divisors is an integer number (4109564772).

Almost surely, 2^21004442122 is an apocalyptic number.

21004442122 is a deficient number, since it is larger than the sum of its proper divisors (11872076054).

21004442122 is a wasteful number, since it uses less digits than its factorization.

21004442122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456618332.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21004442122 its reverse (22124440012), we get a palindrome (43128882134).

The spelling of 21004442122 in words is "twenty-one billion, four million, four hundred forty-two thousand, one hundred twenty-two".