2102201012021 has 4 divisors (see below), whose sum is σ = 2293310194944. Its totient is φ = 1911091829100.

The previous prime is 2102201012017. The next prime is 2102201012033. The reversal of 2102201012021 is 1202101022012.

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 not a de Polignac number, because 2102201012021 - 2² = 2102201012017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102201011987 and 2102201012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102201012321) 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, 95554591445 + ... + 95554591466.

It is an arithmetic number, because the mean of its divisors is an integer number (573327548736).

Almost surely, 2^{2102201012021} is an apocalyptic number.

It is an amenable number.

2102201012021 is a deficient number, since it is larger than the sum of its proper divisors (191109182923).

2102201012021 is a wasteful number, since it uses less digits than its factorization.

2102201012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191109182922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2102201012021 its reverse (1202101022012), we get a palindrome (3304302034033).

Subtracting from 2102201012021 its reverse (1202101022012), we obtain a palindrome (900099990009).

The spelling of 2102201012021 in words is "two trillion, one hundred two billion, two hundred one million, twelve thousand, twenty-one".