221111213121001 has 8 divisors (see below), whose sum is σ = 252699056596224. Its totient is φ = 189523501474560.

The previous prime is 221111213120999. The next prime is 221111213121017. The reversal of 221111213121001 is 100121312111122.

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 221111213121001 - 2¹ = 221111213120999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221111213121001.

It is not an unprimeable number, because it can be changed into a prime (221111213121061) 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, 29336545 + ... + 36095086.

It is an arithmetic number, because the mean of its divisors is an integer number (31587382074528).

Almost surely, 2^{221111213121001} is an apocalyptic number.

It is an amenable number.

221111213121001 is a deficient number, since it is larger than the sum of its proper divisors (31587843475223).

221111213121001 is an equidigital number, since it uses as much as digits as its factorization.

221111213121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65914391.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 221111213121001 its reverse (100121312111122), we get a palindrome (321232525232123).

The spelling of 221111213121001 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred thirteen million, one hundred twenty-one thousand, one".