2221211112121 has 8 divisors (see below), whose sum is σ = 2252565720000. Its totient is φ = 2189858447280.

The previous prime is 2221211112101. The next prime is 2221211112149. The reversal of 2221211112121 is 1212111121222.

It is a happy number.

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 2221211112121 - 2⁷ = 2221211111993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221211112101) 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, 1898730 + ... + 2836828.

It is an arithmetic number, because the mean of its divisors is an integer number (281570715000).

Almost surely, 2^{2221211112121} is an apocalyptic number.

It is an amenable number.

2221211112121 is a deficient number, since it is larger than the sum of its proper divisors (31354607879).

2221211112121 is an equidigital number, since it uses as much as digits as its factorization.

2221211112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971519.

The product of its digits is 64, while the sum is 19.

Adding to 2221211112121 its reverse (1212111121222), we get a palindrome (3433322233343).

It can be divided in two parts, 2221211 and 112121, that added together give a palindrome (2333332).

The spelling of 2221211112121 in words is "two trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty-one".