21121325351 has 8 divisors (see below), whose sum is σ = 25558578720. Its totient is φ = 17039052288.

The previous prime is 21121325341. The next prime is 21121325353. The reversal of 21121325351 is 15352312112.

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

It is a cyclic number.

It is not a de Polignac number, because 21121325351 - 2²⁶ = 21054216487 is a prime.

It is a super-2 number, since 2×21121325351² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121325351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121325353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88744946 + ... + 88745183.

It is an arithmetic number, because the mean of its divisors is an integer number (3194822340).

Almost surely, 2^21121325351 is an apocalyptic number.

21121325351 is a deficient number, since it is larger than the sum of its proper divisors (4437253369).

21121325351 is a wasteful number, since it uses less digits than its factorization.

21121325351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177490153.

The product of its digits is 1800, while the sum is 26.

Adding to 21121325351 its reverse (15352312112), we get a palindrome (36473637463).

The spelling of 21121325351 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-five thousand, three hundred fifty-one".