21122684474 has 8 divisors (see below), whose sum is σ = 31697476308. Its totient is φ = 10556859040.

The previous prime is 21122684419. The next prime is 21122684477. The reversal of 21122684474 is 47448622112.

It can be written as a sum of positive squares in 2 ways, for example, as 20006122249 + 1116562225 = 141443^2 + 33415^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21122684477) 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, 2235707 + ... + 2245134.

Almost surely, 2^21122684474 is an apocalyptic number.

21122684474 is a deficient number, since it is larger than the sum of its proper divisors (10574791834).

21122684474 is a wasteful number, since it uses less digits than its factorization.

21122684474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4483200.

The product of its digits is 172032, while the sum is 41.

The spelling of 21122684474 in words is "twenty-one billion, one hundred twenty-two million, six hundred eighty-four thousand, four hundred seventy-four".