21512251111349 has 8 divisors (see below), whose sum is σ = 21713426991360. Its totient is φ = 21311077579776.

The previous prime is 21512251111343. The next prime is 21512251111391. The reversal of 21512251111349 is 94311115221512.

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 21512251111349 - 2⁴ = 21512251111333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512251111343) 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, 21786812 + ... + 22752794.

It is an arithmetic number, because the mean of its divisors is an integer number (2714178373920).

Almost surely, 2^{21512251111349} is an apocalyptic number.

It is an amenable number.

21512251111349 is a deficient number, since it is larger than the sum of its proper divisors (201175880011).

21512251111349 is a wasteful number, since it uses less digits than its factorization.

21512251111349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174219.

The product of its digits is 21600, while the sum is 38.

The spelling of 21512251111349 in words is "twenty-one trillion, five hundred twelve billion, two hundred fifty-one million, one hundred eleven thousand, three hundred forty-nine".