2102021002221 has 16 divisors (see below), whose sum is σ = 3203105008128. Its totient is φ = 1201145338800.

The previous prime is 2102021002187. The next prime is 2102021002229. The reversal of 2102021002221 is 1222001202012.

It is not a de Polignac number, because 2102021002221 - 2⁹ = 2102021001709 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102021002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102021002229) 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, 2987686 + ... + 3623576.

It is an arithmetic number, because the mean of its divisors is an integer number (200194063008).

Almost surely, 2^{2102021002221} is an apocalyptic number.

2102021002221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2102021002221 is a deficient number, since it is larger than the sum of its proper divisors (1101084005907).

2102021002221 is a wasteful number, since it uses less digits than its factorization.

2102021002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793312.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2102021002221 its reverse (1222001202012), we get a palindrome (3324022204233).

The spelling of 2102021002221 in words is "two trillion, one hundred two billion, twenty-one million, two thousand, two hundred twenty-one".