221001211211001 has 32 divisors (see below), whose sum is σ = 328286094514560. Its totient is φ = 131307691167744.

The previous prime is 221001211210993. The next prime is 221001211211041. The reversal of 221001211211001 is 100112112100122.

It is a happy number.

It is not a de Polignac number, because 221001211211001 - 2³ = 221001211210993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221001211211041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41882230 + ... + 46862816.

It is an arithmetic number, because the mean of its divisors is an integer number (10258940453580).

Almost surely, 2^{221001211211001} is an apocalyptic number.

It is an amenable number.

221001211211001 is a deficient number, since it is larger than the sum of its proper divisors (107284883303559).

221001211211001 is a wasteful number, since it uses less digits than its factorization.

221001211211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019865.

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

Adding to 221001211211001 its reverse (100112112100122), we get a palindrome (321113323311123).

The spelling of 221001211211001 in words is "two hundred twenty-one trillion, one billion, two hundred eleven million, two hundred eleven thousand, one".