21642221322 has 12 divisors (see below), whose sum is σ = 46891479570. Its totient is φ = 7214073768.

The previous prime is 21642221291. The next prime is 21642221323. The reversal of 21642221322 is 22312224612.

21642221322 is a `hidden beast` number, since 2 + 1 + 6 + 422 + 213 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21330310401 + 311910921 = 146049^2 + 17661^2 .

It is not an unprimeable number, because it can be changed into a prime (21642221323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 601172797 + ... + 601172832.

Almost surely, 2^21642221322 is an apocalyptic number.

21642221322 is an abundant number, since it is smaller than the sum of its proper divisors (25249258248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21642221322 is a wasteful number, since it uses less digits than its factorization.

21642221322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202345637 (or 1202345634 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21642221322 its reverse (22312224612), we get a palindrome (43954445934).

The spelling of 21642221322 in words is "twenty-one billion, six hundred forty-two million, two hundred twenty-one thousand, three hundred twenty-two".