21201322122 has 48 divisors (see below), whose sum is σ = 49228957440. Its totient is φ = 6577138656.

The previous prime is 21201322111. The next prime is 21201322139. The reversal of 21201322122 is 22122310212.

21201322122 is a `hidden beast` number, since 21 + 201 + 322 + 122 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21201322095 and 21201322104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 676722 + ... + 707357.

It is an arithmetic number, because the mean of its divisors is an integer number (1025603280).

Almost surely, 2^21201322122 is an apocalyptic number.

21201322122 is an abundant number, since it is smaller than the sum of its proper divisors (28027635318).

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

21201322122 is a wasteful number, since it uses less digits than its factorization.

21201322122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384147 (or 1384144 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21201322122 its reverse (22122310212), we get a palindrome (43323632334).

The spelling of 21201322122 in words is "twenty-one billion, two hundred one million, three hundred twenty-two thousand, one hundred twenty-two".