21220201121101 has 4 divisors (see below), whose sum is σ = 21221776619100. Its totient is φ = 21218625623104.

The previous prime is 21220201121071. The next prime is 21220201121129. The reversal of 21220201121101 is 10112110202212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18646419422500 + 2573781698601 = 4318150^2 + 1604301^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220201121101 - 2²³ = 21220192732493 is a prime.

It is a super-2 number, since 2×21220201121101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220201121401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787728796 + ... + 787755733.

It is an arithmetic number, because the mean of its divisors is an integer number (5305444154775).

Almost surely, 2^{21220201121101} is an apocalyptic number.

It is an amenable number.

21220201121101 is a deficient number, since it is larger than the sum of its proper divisors (1575497999).

21220201121101 is a wasteful number, since it uses less digits than its factorization.

21220201121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575497998.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220201121101 its reverse (10112110202212), we get a palindrome (31332311323313).

The spelling of 21220201121101 in words is "twenty-one trillion, two hundred twenty billion, two hundred one million, one hundred twenty-one thousand, one hundred one".