21331351213 has 8 divisors (see below), whose sum is σ = 21451772160. Its totient is φ = 21211212000.

The previous prime is 21331351211. The next prime is 21331351229. The reversal of 21331351213 is 31215313312.

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 21331351213 - 2¹ = 21331351211 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 (21331351211) 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, 82353 + ... + 222361.

It is an arithmetic number, because the mean of its divisors is an integer number (2681471520).

Almost surely, 2^21331351213 is an apocalyptic number.

It is an amenable number.

21331351213 is a deficient number, since it is larger than the sum of its proper divisors (120420947).

21331351213 is a wasteful number, since it uses less digits than its factorization.

21331351213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140867.

The product of its digits is 1620, while the sum is 25.

Adding to 21331351213 its reverse (31215313312), we get a palindrome (52546664525).

The spelling of 21331351213 in words is "twenty-one billion, three hundred thirty-one million, three hundred fifty-one thousand, two hundred thirteen".