2102100110021 has 4 divisors (see below), whose sum is σ = 2102103306912. Its totient is φ = 2102096913132.

The previous prime is 2102100110009. The next prime is 2102100110069. The reversal of 2102100110021 is 1200110012012.

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-2102100110021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2102100109984 and 2102100110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102100113021) 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, 210275 + ... + 2061168.

It is an arithmetic number, because the mean of its divisors is an integer number (525525826728).

Almost surely, 2^{2102100110021} is an apocalyptic number.

It is an amenable number.

2102100110021 is a deficient number, since it is larger than the sum of its proper divisors (3196891).

2102100110021 is an equidigital number, since it uses as much as digits as its factorization.

2102100110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3196890.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2102100110021 its reverse (1200110012012), we get a palindrome (3302210122033).

The spelling of 2102100110021 in words is "two trillion, one hundred two billion, one hundred million, one hundred ten thousand, twenty-one".