21201121222101 has 24 divisors (see below), whose sum is σ = 31830447099360. Its totient is φ = 13586390918496.

The previous prime is 21201121222093. The next prime is 21201121222111. The reversal of 21201121222101 is 10122212110212.

21201121222101 is a `hidden beast` number, since 21 + 201 + 121 + 222 + 101 = 666.

It is not a de Polignac number, because 21201121222101 - 2³ = 21201121222093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201121222111) 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, 383508691 + ... + 383563968.

It is an arithmetic number, because the mean of its divisors is an integer number (1326268629140).

Almost surely, 2^{21201121222101} is an apocalyptic number.

It is an amenable number.

21201121222101 is a deficient number, since it is larger than the sum of its proper divisors (10629325877259).

21201121222101 is a wasteful number, since it uses less digits than its factorization.

21201121222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767072785 (or 767072782 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21201121222101 its reverse (10122212110212), we get a palindrome (31323333332313).

The spelling of 21201121222101 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred one".