2102121221221 has 8 divisors (see below), whose sum is σ = 2406864967424. Its totient is φ = 1798487653680.

The previous prime is 2102121221197. The next prime is 2102121221261. The reversal of 2102121221221 is 1221221212012.

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

It is a cyclic number.

It is not a de Polignac number, because 2102121221221 - 2⁹ = 2102121220709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102121221261) 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, 277540605 + ... + 277548178.

It is an arithmetic number, because the mean of its divisors is an integer number (300858120928).

Almost surely, 2^{2102121221221} is an apocalyptic number.

It is an amenable number.

2102121221221 is a deficient number, since it is larger than the sum of its proper divisors (304743746203).

2102121221221 is an equidigital number, since it uses as much as digits as its factorization.

2102121221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555089331.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2102121221221 its reverse (1221221212012), we get a palindrome (3323342433233).

The spelling of 2102121221221 in words is "two trillion, one hundred two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".