21222221121101 has 32 divisors (see below), whose sum is σ = 28814330361600. Its totient is φ = 15093220538880.

The previous prime is 21222221121067. The next prime is 21222221121107. The reversal of 21222221121101 is 10112112222212.

It is not a de Polignac number, because 21222221121101 - 2¹⁴ = 21222221104717 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 (21222221121107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119017766 + ... + 119195943.

It is an arithmetic number, because the mean of its divisors is an integer number (900447823800).

Almost surely, 2^{21222221121101} is an apocalyptic number.

It is an amenable number.

21222221121101 is a deficient number, since it is larger than the sum of its proper divisors (7592109240499).

21222221121101 is a wasteful number, since it uses less digits than its factorization.

21222221121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238213829.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21222221121101 its reverse (10112112222212), we get a palindrome (31334333343313).

The spelling of 21222221121101 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred one".