21332211121 has 8 divisors (see below), whose sum is σ = 23032212840. Its totient is φ = 19640646912.

The previous prime is 21332211091. The next prime is 21332211161. The reversal of 21332211121 is 12111223312.

It can be written as a sum of positive squares in 4 ways, for example, as 1965592225 + 19366618896 = 44335^2 + 139164^2 .

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 21332211121 - 2³¹ = 19184727473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21332211161) 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, 2104120 + ... + 2114233.

It is an arithmetic number, because the mean of its divisors is an integer number (2879026605).

Almost surely, 2^21332211121 is an apocalyptic number.

It is an amenable number.

21332211121 is a deficient number, since it is larger than the sum of its proper divisors (1700001719).

21332211121 is a wasteful number, since it uses less digits than its factorization.

21332211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4218755.

The product of its digits is 144, while the sum is 19.

Adding to 21332211121 its reverse (12111223312), we get a palindrome (33443434433).

The spelling of 21332211121 in words is "twenty-one billion, three hundred thirty-two million, two hundred eleven thousand, one hundred twenty-one".