2102210101221 has 8 divisors (see below), whose sum is σ = 2802953658624. Its totient is φ = 1401469972320.

The previous prime is 2102210101217. The next prime is 2102210101259. The reversal of 2102210101221 is 1221010122012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2102210101221 - 2² = 2102210101217 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 2102210101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102210101021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1498156 + ... + 2539466.

It is an arithmetic number, because the mean of its divisors is an integer number (350369207328).

Almost surely, 2^{2102210101221} is an apocalyptic number.

It is an amenable number.

2102210101221 is a deficient number, since it is larger than the sum of its proper divisors (700743557403).

2102210101221 is a wasteful number, since it uses less digits than its factorization.

2102210101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714251.

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

Adding to 2102210101221 its reverse (1221010122012), we get a palindrome (3323220223233).

The spelling of 2102210101221 in words is "two trillion, one hundred two billion, two hundred ten million, one hundred one thousand, two hundred twenty-one".