21335314121 has 32 divisors (see below), whose sum is σ = 23906949120. Its totient is φ = 18877968000.

The previous prime is 21335314103. The next prime is 21335314129. The reversal of 21335314121 is 12141353312.

It is a cyclic number.

It is not a de Polignac number, because 21335314121 - 2³⁰ = 20261572297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21335314129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21703796 + ... + 21704778.

It is an arithmetic number, because the mean of its divisors is an integer number (747092160).

Almost surely, 2^21335314121 is an apocalyptic number.

It is an amenable number.

21335314121 is a deficient number, since it is larger than the sum of its proper divisors (2571634999).

21335314121 is a wasteful number, since it uses less digits than its factorization.

21335314121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397.

The product of its digits is 2160, while the sum is 26.

Adding to 21335314121 its reverse (12141353312), we get a palindrome (33476667433).

The spelling of 21335314121 in words is "twenty-one billion, three hundred thirty-five million, three hundred fourteen thousand, one hundred twenty-one".