21552173122 has 8 divisors (see below), whose sum is σ = 32737478400. Its totient is φ = 10639680324.

The previous prime is 21552173099. The next prime is 21552173129. The reversal of 21552173122 is 22137125512.

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 (21552173129) 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, 68202922 + ... + 68203237.

It is an arithmetic number, because the mean of its divisors is an integer number (4092184800).

Almost surely, 2^21552173122 is an apocalyptic number.

21552173122 is a deficient number, since it is larger than the sum of its proper divisors (11185305278).

21552173122 is a wasteful number, since it uses less digits than its factorization.

21552173122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136406240.

The product of its digits is 8400, while the sum is 31.

Adding to 21552173122 its reverse (22137125512), we get a palindrome (43689298634).

The spelling of 21552173122 in words is "twenty-one billion, five hundred fifty-two million, one hundred seventy-three thousand, one hundred twenty-two".