21113133121 has 8 divisors (see below), whose sum is σ = 21402402560. Its totient is φ = 20825601552.

The previous prime is 21113133113. The next prime is 21113133143. The reversal of 21113133121 is 12133131112.

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 21113133121 - 2³ = 21113133113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113133101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409995 + ... + 458608.

It is an arithmetic number, because the mean of its divisors is an integer number (2675300320).

Almost surely, 2^21113133121 is an apocalyptic number.

It is an amenable number.

21113133121 is a deficient number, since it is larger than the sum of its proper divisors (289269439).

21113133121 is a wasteful number, since it uses less digits than its factorization.

21113133121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868935.

The product of its digits is 108, while the sum is 19.

Adding to 21113133121 its reverse (12133131112), we get a palindrome (33246264233).

The spelling of 21113133121 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-three thousand, one hundred twenty-one".