21333422121 has 16 divisors (see below), whose sum is σ = 31315120320. Its totient is φ = 12810726720.

The previous prime is 21333422119. The next prime is 21333422141. The reversal of 21333422121 is 12122433312.

It is not a de Polignac number, because 21333422121 - 2¹ = 21333422119 is a prime.

It is a super-2 number, since 2×21333422121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21333422091 and 21333422100.

It is not an unprimeable number, because it can be changed into a prime (21333422141) 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, 2961850 + ... + 2969043.

It is an arithmetic number, because the mean of its divisors is an integer number (1957195020).

Almost surely, 2^21333422121 is an apocalyptic number.

It is an amenable number.

21333422121 is a deficient number, since it is larger than the sum of its proper divisors (9981698199).

21333422121 is a wasteful number, since it uses less digits than its factorization.

21333422121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5931016.

The product of its digits is 1728, while the sum is 24.

Adding to 21333422121 its reverse (12122433312), we get a palindrome (33455855433).

The spelling of 21333422121 in words is "twenty-one billion, three hundred thirty-three million, four hundred twenty-two thousand, one hundred twenty-one".