2101001221121 has 4 divisors (see below), whose sum is σ = 2292001332144. Its totient is φ = 1910001110100.

The previous prime is 2101001221051. The next prime is 2101001221133. The reversal of 2101001221121 is 1211221001012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101001221121 is a prime.

It is a super-2 number, since 2×2101001221121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101001221096 and 2101001221105.

It is not an unprimeable number, because it can be changed into a prime (2101001221181) 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, 95500055495 + ... + 95500055516.

It is an arithmetic number, because the mean of its divisors is an integer number (573000333036).

Almost surely, 2^{2101001221121} is an apocalyptic number.

It is an amenable number.

2101001221121 is a deficient number, since it is larger than the sum of its proper divisors (191000111023).

2101001221121 is a wasteful number, since it uses less digits than its factorization.

2101001221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191000111022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2101001221121 its reverse (1211221001012), we get a palindrome (3312222222133).

The spelling of 2101001221121 in words is "two trillion, one hundred one billion, one million, two hundred twenty-one thousand, one hundred twenty-one".