21111433334321 has 16 divisors (see below), whose sum is σ = 23121503510976. Its totient is φ = 19116643200000.

The previous prime is 21111433334291. The next prime is 21111433334347. The reversal of 21111433334321 is 12343333411112.

It is a cyclic number.

It is not a de Polignac number, because 21111433334321 - 2¹⁴ = 21111433317937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111433334821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415160 + ... + 6511161.

It is an arithmetic number, because the mean of its divisors is an integer number (1445093969436).

Almost surely, 2^{21111433334321} is an apocalyptic number.

It is an amenable number.

21111433334321 is a deficient number, since it is larger than the sum of its proper divisors (2010070176655).

21111433334321 is a wasteful number, since it uses less digits than its factorization.

21111433334321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6927424.

The product of its digits is 15552, while the sum is 32.

Adding to 21111433334321 its reverse (12343333411112), we get a palindrome (33454766745433).

The spelling of 21111433334321 in words is "twenty-one trillion, one hundred eleven billion, four hundred thirty-three million, three hundred thirty-four thousand, three hundred twenty-one".