21121220201101 has 32 divisors (see below), whose sum is σ = 24000935270400. Its totient is φ = 18478498610880.

The previous prime is 21121220201057. The next prime is 21121220201111. The reversal of 21121220201101 is 10110202212112.

It is a cyclic number.

It is not a de Polignac number, because 21121220201101 - 2⁹ = 21121220200589 is a prime.

It is a super-2 number, since 2×21121220201101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121220201111) 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, 266942536 + ... + 267021646.

It is an arithmetic number, because the mean of its divisors is an integer number (750029227200).

Almost surely, 2^{21121220201101} is an apocalyptic number.

It is an amenable number.

21121220201101 is a deficient number, since it is larger than the sum of its proper divisors (2879715069299).

21121220201101 is a wasteful number, since it uses less digits than its factorization.

21121220201101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100249.

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

Adding to 21121220201101 its reverse (10110202212112), we get a palindrome (31231422413213).

The spelling of 21121220201101 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, two hundred one thousand, one hundred one".