21143313422121 has 32 divisors (see below), whose sum is σ = 30852735418368. Its totient is φ = 12772992491840.

The previous prime is 21143313422113. The next prime is 21143313422183. The reversal of 21143313422121 is 12122431334112.

It is a cyclic number.

It is not a de Polignac number, because 21143313422121 - 2³ = 21143313422113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21143313462121) 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, 20567455 + ... + 21570971.

It is an arithmetic number, because the mean of its divisors is an integer number (964147981824).

Almost surely, 2^{21143313422121} is an apocalyptic number.

It is an amenable number.

21143313422121 is a deficient number, since it is larger than the sum of its proper divisors (9709421996247).

21143313422121 is a wasteful number, since it uses less digits than its factorization.

21143313422121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005581.

The product of its digits is 6912, while the sum is 30.

Adding to 21143313422121 its reverse (12122431334112), we get a palindrome (33265744756233).

The spelling of 21143313422121 in words is "twenty-one trillion, one hundred forty-three billion, three hundred thirteen million, four hundred twenty-two thousand, one hundred twenty-one".