2101102120021 has 8 divisors (see below), whose sum is σ = 2124738394200. Its totient is φ = 2077466476800.

The previous prime is 2101102119997. The next prime is 2101102120049. The reversal of 2101102120021 is 1200212011012.

It can be written as a sum of positive squares in 4 ways, for example, as 228446717521 + 1872655402500 = 477961^2 + 1368450^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101102120021 - 2²³ = 2101093731413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101102119983 and 2101102120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101102120081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10779295 + ... + 10972483.

It is an arithmetic number, because the mean of its divisors is an integer number (265592299275).

Almost surely, 2^{2101102120021} is an apocalyptic number.

It is an amenable number.

2101102120021 is a deficient number, since it is larger than the sum of its proper divisors (23636274179).

2101102120021 is a wasteful number, since it uses less digits than its factorization.

2101102120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315479.

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

Adding to 2101102120021 its reverse (1200212011012), we get a palindrome (3301314131033).

The spelling of 2101102120021 in words is "two trillion, one hundred one billion, one hundred two million, one hundred twenty thousand, twenty-one".