21323210221213 has 4 divisors (see below), whose sum is σ = 21323333394880. Its totient is φ = 21323087047548.

The previous prime is 21323210221151. The next prime is 21323210221273. The reversal of 21323210221213 is 31212201232312.

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 21323210221213 - 2⁹ = 21323210220701 is a prime.

It is a super-3 number, since 3×21323210221213³ (a number of 41 digits) contains 333 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 (21323210221273) 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, 61326795 + ... + 61673512.

It is an arithmetic number, because the mean of its divisors is an integer number (5330833348720).

Almost surely, 2^{21323210221213} is an apocalyptic number.

It is an amenable number.

21323210221213 is a deficient number, since it is larger than the sum of its proper divisors (123173667).

21323210221213 is a wasteful number, since it uses less digits than its factorization.

21323210221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123173666.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21323210221213 its reverse (31212201232312), we get a palindrome (52535411453525).

The spelling of 21323210221213 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred ten million, two hundred twenty-one thousand, two hundred thirteen".