2221210122221 has 4 divisors (see below), whose sum is σ = 2221226429952. Its totient is φ = 2221193814492.

The previous prime is 2221210122217. The next prime is 2221210122223. The reversal of 2221210122221 is 1222210121222.

2221210122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2221210122221 - 2² = 2221210122217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221210122193 and 2221210122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221210122223) 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, 7947821 + ... + 8222546.

It is an arithmetic number, because the mean of its divisors is an integer number (555306607488).

Almost surely, 2^{2221210122221} is an apocalyptic number.

It is an amenable number.

2221210122221 is a deficient number, since it is larger than the sum of its proper divisors (16307731).

2221210122221 is a wasteful number, since it uses less digits than its factorization.

2221210122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16307730.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2221210122221 its reverse (1222210121222), we get a palindrome (3443420243443).

Subtracting from 2221210122221 its reverse (1222210121222), we obtain a palindrome (999000000999).

The spelling of 2221210122221 in words is "two trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".