21312121310333 has 8 divisors (see below), whose sum is σ = 24356842996800. Its totient is φ = 18267432855840.

The previous prime is 21312121310093. The next prime is 21312121310387. The reversal of 21312121310333 is 33301312121312.

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

It is not a de Polignac number, because 21312121310333 - 2²² = 21312117116029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312121300333) 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, 6918248 + ... + 9512433.

It is an arithmetic number, because the mean of its divisors is an integer number (3044605374600).

Almost surely, 2^{21312121310333} is an apocalyptic number.

It is an amenable number.

21312121310333 is a deficient number, since it is larger than the sum of its proper divisors (3044721686467).

21312121310333 is a wasteful number, since it uses less digits than its factorization.

21312121310333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16615987.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21312121310333 its reverse (33301312121312), we get a palindrome (54613433431645).

The spelling of 21312121310333 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-one million, three hundred ten thousand, three hundred thirty-three".