221111201000121 has 4 divisors (see below), whose sum is σ = 294814934666832. Its totient is φ = 147407467333412.

The previous prime is 221111201000099. The next prime is 221111201000143. The reversal of 221111201000121 is 121000102111122.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (221111201000099) and next prime (221111201000143).

It is a cyclic number.

It is not a de Polignac number, because 221111201000121 - 2³⁷ = 220973762046649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221111201000121.

It is not an unprimeable number, because it can be changed into a prime (221111201020121) 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, 36851866833351 + ... + 36851866833356.

It is an arithmetic number, because the mean of its divisors is an integer number (73703733666708).

Almost surely, 2^{221111201000121} is an apocalyptic number.

It is an amenable number.

221111201000121 is a deficient number, since it is larger than the sum of its proper divisors (73703733666711).

221111201000121 is an equidigital number, since it uses as much as digits as its factorization.

221111201000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73703733666710.

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

Adding to 221111201000121 its reverse (121000102111122), we get a palindrome (342111303111243).

The spelling of 221111201000121 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred one million, one hundred twenty-one", and thus it is an aban number.