2101222211221 has 4 divisors (see below), whose sum is σ = 2401396812832. Its totient is φ = 1801047609612.

The previous prime is 2101222211219. The next prime is 2101222211267. The reversal of 2101222211221 is 1221122221012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101222211221 - 2¹ = 2101222211219 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 (2101222211521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150087300795 + ... + 150087300808.

It is an arithmetic number, because the mean of its divisors is an integer number (600349203208).

Almost surely, 2^{2101222211221} is an apocalyptic number.

It is an amenable number.

2101222211221 is a deficient number, since it is larger than the sum of its proper divisors (300174601611).

2101222211221 is an equidigital number, since it uses as much as digits as its factorization.

2101222211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300174601610.

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

Adding to 2101222211221 its reverse (1221122221012), we get a palindrome (3322344432233).

The spelling of 2101222211221 in words is "two trillion, one hundred one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".