221211111012001 has 16 divisors (see below), whose sum is σ = 242420427325440. Its totient is φ = 200185124170320.

The previous prime is 221211111011899. The next prime is 221211111012013. The reversal of 221211111012001 is 100210111112122.

It is a cyclic number.

It is not a de Polignac number, because 221211111012001 - 2²¹ = 221211108914849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211111712001) 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, 31772320 + ... + 38103838.

It is an arithmetic number, because the mean of its divisors is an integer number (15151276707840).

Almost surely, 2^{221211111012001} is an apocalyptic number.

It is an amenable number.

221211111012001 is a deficient number, since it is larger than the sum of its proper divisors (21209316313439).

221211111012001 is a wasteful number, since it uses less digits than its factorization.

221211111012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6345996.

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

Adding to 221211111012001 its reverse (100210111112122), we get a palindrome (321421222124123).

The spelling of 221211111012001 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred eleven million, twelve thousand, one".