21382161522 has 16 divisors (see below), whose sum is σ = 42829027392. Its totient is φ = 7116603120.

The previous prime is 21382161491. The next prime is 21382161551. The reversal of 21382161522 is 22516128312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2691718 + ... + 2699649.

It is an arithmetic number, because the mean of its divisors is an integer number (2676814212).

Almost surely, 2^21382161522 is an apocalyptic number.

21382161522 is an abundant number, since it is smaller than the sum of its proper divisors (21446865870).

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

21382161522 is a wasteful number, since it uses less digits than its factorization.

21382161522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5392033.

The product of its digits is 11520, while the sum is 33.

Adding to 21382161522 its reverse (22516128312), we get a palindrome (43898289834).

The spelling of 21382161522 in words is "twenty-one billion, three hundred eighty-two million, one hundred sixty-one thousand, five hundred twenty-two".