21315324143213 has 4 divisors (see below), whose sum is σ = 21615539976288. Its totient is φ = 21015108310140.

The previous prime is 21315324143177. The next prime is 21315324143231. The reversal of 21315324143213 is 31234142351312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21315324143213 - 2¹² = 21315324139117 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 (21315324146213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150107916431 + ... + 150107916572.

It is an arithmetic number, because the mean of its divisors is an integer number (5403884994072).

Almost surely, 2^{21315324143213} is an apocalyptic number.

It is an amenable number.

21315324143213 is a deficient number, since it is larger than the sum of its proper divisors (300215833075).

21315324143213 is an equidigital number, since it uses as much as digits as its factorization.

21315324143213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300215833074.

The product of its digits is 51840, while the sum is 35.

Adding to 21315324143213 its reverse (31234142351312), we get a palindrome (52549466494525).

The spelling of 21315324143213 in words is "twenty-one trillion, three hundred fifteen billion, three hundred twenty-four million, one hundred forty-three thousand, two hundred thirteen".