21221121121101 has 24 divisors (see below), whose sum is σ = 33455183224320. Its totient is φ = 12855192892800.

The previous prime is 21221121121093. The next prime is 21221121121129. The reversal of 21221121121101 is 10112112112212.

It is a happy number.

21221121121101 is a `hidden beast` number, since 21 + 221 + 1 + 211 + 211 + 0 + 1 = 666.

It is not a de Polignac number, because 21221121121101 - 2³ = 21221121121093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221121121301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50561916 + ... + 50979893.

It is an arithmetic number, because the mean of its divisors is an integer number (1393965967680).

Almost surely, 2^{21221121121101} is an apocalyptic number.

It is an amenable number.

21221121121101 is a deficient number, since it is larger than the sum of its proper divisors (12234062103219).

21221121121101 is a wasteful number, since it uses less digits than its factorization.

21221121121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101543937 (or 101543934 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21221121121101 its reverse (10112112112212), we get a palindrome (31333233233313).

It can be divided in two parts, 212211 and 21121101, that added together give a palindrome (21333312).

The spelling of 21221121121101 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred one".