21121334231 has 8 divisors (see below), whose sum is σ = 21216438144. Its totient is φ = 21026292480.

The previous prime is 21121334209. The next prime is 21121334239. The reversal of 21121334231 is 13243312112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121334231 is a prime.

It is a super-2 number, since 2×21121334231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121334197 and 21121334206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121334239) 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, 749411 + ... + 777083.

It is an arithmetic number, because the mean of its divisors is an integer number (2652054768).

Almost surely, 2^21121334231 is an apocalyptic number.

21121334231 is a deficient number, since it is larger than the sum of its proper divisors (95103913).

21121334231 is a wasteful number, since it uses less digits than its factorization.

21121334231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31081.

The product of its digits is 864, while the sum is 23.

Adding to 21121334231 its reverse (13243312112), we get a palindrome (34364646343).

The spelling of 21121334231 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirty-four thousand, two hundred thirty-one".