21033121312331 has 8 divisors (see below), whose sum is σ = 21036983688240. Its totient is φ = 21029259263328.

The previous prime is 21033121312309. The next prime is 21033121312349. The reversal of 21033121312331 is 13321312133012.

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 21033121312331 - 2¹⁴ = 21033121295947 is a prime.

It is a super-2 number, since 2×21033121312331² (a number of 27 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 21033121312331.

It is not an unprimeable number, because it can be changed into a prime (21033121312351) 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, 154318145 + ... + 154454381.

It is an arithmetic number, because the mean of its divisors is an integer number (2629622961030).

Almost surely, 2^{21033121312331} is an apocalyptic number.

21033121312331 is a deficient number, since it is larger than the sum of its proper divisors (3862375909).

21033121312331 is a wasteful number, since it uses less digits than its factorization.

21033121312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163453.

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

Adding to 21033121312331 its reverse (13321312133012), we get a palindrome (34354433445343).

The spelling of 21033121312331 in words is "twenty-one trillion, thirty-three billion, one hundred twenty-one million, three hundred twelve thousand, three hundred thirty-one".