21132211121 has 8 divisors (see below), whose sum is σ = 24299265984. Its totient is φ = 18002198160.

The previous prime is 21132211109. The next prime is 21132211123. The reversal of 21132211121 is 12111223112.

It is a happy number.

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 21132211121 - 2¹⁰ = 21132210097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21132211121.

It is not an unprimeable number, because it can be changed into a prime (21132211123) 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, 9259250 + ... + 9261531.

It is an arithmetic number, because the mean of its divisors is an integer number (3037408248).

Almost surely, 2^21132211121 is an apocalyptic number.

It is an amenable number.

21132211121 is a deficient number, since it is larger than the sum of its proper divisors (3167054863).

21132211121 is a wasteful number, since it uses less digits than its factorization.

21132211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18520951.

The product of its digits is 48, while the sum is 17.

Adding to 21132211121 its reverse (12111223112), we get a palindrome (33243434233).

The spelling of 21132211121 in words is "twenty-one billion, one hundred thirty-two million, two hundred eleven thousand, one hundred twenty-one".