21133322121 has 8 divisors (see below), whose sum is σ = 28865025504. Its totient is φ = 13745250080.

The previous prime is 21133322117. The next prime is 21133322141. The reversal of 21133322121 is 12122333112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21133322121 - 2² = 21133322117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21133322141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85907691 + ... + 85907936.

It is an arithmetic number, because the mean of its divisors is an integer number (3608128188).

Almost surely, 2^21133322121 is an apocalyptic number.

It is an amenable number.

21133322121 is a deficient number, since it is larger than the sum of its proper divisors (7731703383).

21133322121 is a wasteful number, since it uses less digits than its factorization.

21133322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171815671.

The product of its digits is 432, while the sum is 21.

Adding to 21133322121 its reverse (12122333112), we get a palindrome (33255655233).

The spelling of 21133322121 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty-two thousand, one hundred twenty-one".