221001002111121 has 16 divisors (see below), whose sum is σ = 328422541838400. Its totient is φ = 131369016734208.

The previous prime is 221001002111119. The next prime is 221001002111137. The reversal of 221001002111121 is 121111200100122.

It is a happy number.

It is not a de Polignac number, because 221001002111121 - 2¹ = 221001002111119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221001002111121.

It is not an unprimeable number, because it can be changed into a prime (221001002111101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114035603836 + ... + 114035605773.

It is an arithmetic number, because the mean of its divisors is an integer number (20526408864900).

Almost surely, 2^{221001002111121} is an apocalyptic number.

It is an amenable number.

221001002111121 is a deficient number, since it is larger than the sum of its proper divisors (107421539727279).

221001002111121 is a wasteful number, since it uses less digits than its factorization.

221001002111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228071209648.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221001002111121 its reverse (121111200100122), we get a palindrome (342112202211243).

The spelling of 221001002111121 in words is "two hundred twenty-one trillion, one billion, two million, one hundred eleven thousand, one hundred twenty-one".