2102021211021 has 16 divisors (see below), whose sum is σ = 2807531785920. Its totient is φ = 1398931142400.

The previous prime is 2102021211013. The next prime is 2102021211067. The reversal of 2102021211021 is 1201121202012.

It is not a de Polignac number, because 2102021211021 - 2³ = 2102021211013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102021211091) 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, 3786415 + ... + 4305923.

It is an arithmetic number, because the mean of its divisors is an integer number (175470736620).

Almost surely, 2^{2102021211021} is an apocalyptic number.

It is an amenable number.

2102021211021 is a deficient number, since it is larger than the sum of its proper divisors (705510574899).

2102021211021 is a wasteful number, since it uses less digits than its factorization.

2102021211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521836.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2102021211021 its reverse (1201121202012), we get a palindrome (3303142413033).

Subtracting from 2102021211021 its reverse (1201121202012), we obtain a palindrome (900900009009).

The spelling of 2102021211021 in words is "two trillion, one hundred two billion, twenty-one million, two hundred eleven thousand, twenty-one".