21213612326411 has 4 divisors (see below), whose sum is σ = 21482139064800. Its totient is φ = 20945085588024.

The previous prime is 21213612326393. The next prime is 21213612326449. The reversal of 21213612326411 is 11462321631212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21213612326411 - 2³⁸ = 20938734419467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213612322411) 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, 134263369076 + ... + 134263369233.

It is an arithmetic number, because the mean of its divisors is an integer number (5370534766200).

Almost surely, 2^{21213612326411} is an apocalyptic number.

21213612326411 is a deficient number, since it is larger than the sum of its proper divisors (268526738389).

21213612326411 is an equidigital number, since it uses as much as digits as its factorization.

21213612326411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268526738388.

The product of its digits is 20736, while the sum is 35.

Adding to 21213612326411 its reverse (11462321631212), we get a palindrome (32675933957623).

The spelling of 21213612326411 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, three hundred twenty-six thousand, four hundred eleven".