221001111012121 has 8 divisors (see below), whose sum is σ = 241092462326688. Its totient is φ = 200909816568000.

The previous prime is 221001111012113. The next prime is 221001111012137. The reversal of 221001111012121 is 121210111100122.

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 221001111012121 - 2³ = 221001111012113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221001111012095 and 221001111012104.

It is not an unprimeable number, because it can be changed into a prime (221001111012421) 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, 5879635 + ... + 21830536.

It is an arithmetic number, because the mean of its divisors is an integer number (30136557790836).

Almost surely, 2^{221001111012121} is an apocalyptic number.

It is an amenable number.

221001111012121 is a deficient number, since it is larger than the sum of its proper divisors (20091351314567).

221001111012121 is a wasteful number, since it uses less digits than its factorization.

221001111012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28435223.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 221001111012121 its reverse (121210111100122), we get a palindrome (342211222112243).

The spelling of 221001111012121 in words is "two hundred twenty-one trillion, one billion, one hundred eleven million, twelve thousand, one hundred twenty-one".