2121001022101 has 16 divisors (see below), whose sum is σ = 2300722401600. Its totient is φ = 1943648074368.

The previous prime is 2121001022093. The next prime is 2121001022171. The reversal of 2121001022101 is 1012201001212.

It is not a de Polignac number, because 2121001022101 - 2³ = 2121001022093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121001022171) 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, 57388110 + ... + 57425056.

It is an arithmetic number, because the mean of its divisors is an integer number (143795150100).

Almost surely, 2^{2121001022101} is an apocalyptic number.

It is an amenable number.

2121001022101 is a deficient number, since it is larger than the sum of its proper divisors (179721379499).

2121001022101 is a wasteful number, since it uses less digits than its factorization.

2121001022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68868.

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

Adding to 2121001022101 its reverse (1012201001212), we get a palindrome (3133202023313).

The spelling of 2121001022101 in words is "two trillion, one hundred twenty-one billion, one million, twenty-two thousand, one hundred one".