21321201230213 has 4 divisors (see below), whose sum is σ = 21321352560768. Its totient is φ = 21321049899660.

The previous prime is 21321201230207. The next prime is 21321201230261. The reversal of 21321201230213 is 31203210212312.

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 21321201230213 - 2⁶ = 21321201230149 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 (21321201232213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75453743 + ... + 75735788.

It is an arithmetic number, because the mean of its divisors is an integer number (5330338140192).

Almost surely, 2^{21321201230213} is an apocalyptic number.

It is an amenable number.

21321201230213 is a deficient number, since it is larger than the sum of its proper divisors (151330555).

21321201230213 is a wasteful number, since it uses less digits than its factorization.

21321201230213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151330554.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21321201230213 its reverse (31203210212312), we get a palindrome (52524411442525).

The spelling of 21321201230213 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred one million, two hundred thirty thousand, two hundred thirteen".