2102002021221 has 64 divisors (see below), whose sum is σ = 3027488679936. Its totient is φ = 1293935385600.

The previous prime is 2102002021187. The next prime is 2102002021279. The reversal of 2102002021221 is 1221202002012.

It is not a de Polignac number, because 2102002021221 - 2⁹ = 2102002020709 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 2102002021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102002020221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 283629006 + ... + 283636416.

It is an arithmetic number, because the mean of its divisors is an integer number (47304510624).

Almost surely, 2^{2102002021221} is an apocalyptic number.

It is an amenable number.

2102002021221 is a deficient number, since it is larger than the sum of its proper divisors (925486658715).

2102002021221 is a wasteful number, since it uses less digits than its factorization.

2102002021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8522.

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

Adding to 2102002021221 its reverse (1221202002012), we get a palindrome (3323204023233).

The spelling of 2102002021221 in words is "two trillion, one hundred two billion, two million, twenty-one thousand, two hundred twenty-one".