21121334351 has 8 divisors (see below), whose sum is σ = 22748195904. Its totient is φ = 19494779040.

The previous prime is 21121334347. The next prime is 21121334359. The reversal of 21121334351 is 15343312112.

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 21121334351 - 2² = 21121334347 is a prime.

It is a super-2 number, since 2×21121334351² (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 21121334351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121334359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78305 + ... + 219941.

It is an arithmetic number, because the mean of its divisors is an integer number (2843524488).

Almost surely, 2^21121334351 is an apocalyptic number.

21121334351 is a deficient number, since it is larger than the sum of its proper divisors (1626861553).

21121334351 is a wasteful number, since it uses less digits than its factorization.

21121334351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153121.

The product of its digits is 2160, while the sum is 26.

Adding to 21121334351 its reverse (15343312112), we get a palindrome (36464646463).

The spelling of 21121334351 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirty-four thousand, three hundred fifty-one".