21213222021311 has 4 divisors (see below), whose sum is σ = 21222123921312. Its totient is φ = 21204320121312.

The previous prime is 21213222021307. The next prime is 21213222021331. The reversal of 21213222021311 is 11312022231212.

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 21213222021311 - 2² = 21213222021307 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 (21213222021331) 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, 4450946426 + ... + 4450951191.

It is an arithmetic number, because the mean of its divisors is an integer number (5305530980328).

Almost surely, 2^{21213222021311} is an apocalyptic number.

21213222021311 is a deficient number, since it is larger than the sum of its proper divisors (8901900001).

21213222021311 is an equidigital number, since it uses as much as digits as its factorization.

21213222021311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8901900000.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21213222021311 its reverse (11312022231212), we get a palindrome (32525244252523).

The spelling of 21213222021311 in words is "twenty-one trillion, two hundred thirteen billion, two hundred twenty-two million, twenty-one thousand, three hundred eleven".