21201221101 has 8 divisors (see below), whose sum is σ = 22450984704. Its totient is φ = 19951750080.

The previous prime is 21201221089. The next prime is 21201221137. The reversal of 21201221101 is 10112210212.

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 21201221101 - 2²¹ = 21199123949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201221161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85956 + ... + 223138.

It is an arithmetic number, because the mean of its divisors is an integer number (2806373088).

Almost surely, 2^21201221101 is an apocalyptic number.

It is an amenable number.

21201221101 is a deficient number, since it is larger than the sum of its proper divisors (1249763603).

21201221101 is a wasteful number, since it uses less digits than its factorization.

21201221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146291.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201221101 its reverse (10112210212), we get a palindrome (31313431313).

It can be divided in two parts, 2120 and 1221101, that added together give a palindrome (1223221).

The spelling of 21201221101 in words is "twenty-one billion, two hundred one million, two hundred twenty-one thousand, one hundred one".