21331033231213 has 8 divisors (see below), whose sum is σ = 21532885312032. Its totient is φ = 21129227384496.

The previous prime is 21331033231171. The next prime is 21331033231217. The reversal of 21331033231213 is 31213233013312.

It is a happy number.

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 21331033231213 - 2⁹ = 21331033230701 is a prime.

It is a super-2 number, since 2×21331033231213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331033231217) 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, 10631070 + ... + 12477247.

It is an arithmetic number, because the mean of its divisors is an integer number (2691610664004).

Almost surely, 2^{21331033231213} is an apocalyptic number.

It is an amenable number.

21331033231213 is a deficient number, since it is larger than the sum of its proper divisors (201852080819).

21331033231213 is a wasteful number, since it uses less digits than its factorization.

21331033231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23117051.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21331033231213 its reverse (31213233013312), we get a palindrome (52544266244525).

The spelling of 21331033231213 in words is "twenty-one trillion, three hundred thirty-one billion, thirty-three million, two hundred thirty-one thousand, two hundred thirteen".