21001121201101 has 16 divisors (see below), whose sum is σ = 23407579627200. Its totient is φ = 18724852124928.

The previous prime is 21001121201087. The next prime is 21001121201113. The reversal of 21001121201101 is 10110212110012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21001121201101 - 2⁵ = 21001121201069 is a prime.

It is a super-2 number, since 2×21001121201101² (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 (21001121241101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9099391 + ... + 11171443.

It is an arithmetic number, because the mean of its divisors is an integer number (1462973726700).

Almost surely, 2^{21001121201101} is an apocalyptic number.

It is an amenable number.

21001121201101 is a deficient number, since it is larger than the sum of its proper divisors (2406458426099).

21001121201101 is a wasteful number, since it uses less digits than its factorization.

21001121201101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103468.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001121201101 its reverse (10110212110012), we get a palindrome (31111333311113).

The spelling of 21001121201101 in words is "twenty-one trillion, one billion, one hundred twenty-one million, two hundred one thousand, one hundred one".