221210001221001 has 64 divisors (see below), whose sum is σ = 321295828998144. Its totient is φ = 134565110784000.

The previous prime is 221210001220963. The next prime is 221210001221003. The reversal of 221210001221001 is 100122100012122.

It is not a de Polignac number, because 221210001221001 - 2⁶ = 221210001220937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221210001221003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15065715006 + ... + 15065729688.

It is an arithmetic number, because the mean of its divisors is an integer number (5020247328096).

Almost surely, 2^{221210001221001} is an apocalyptic number.

It is an amenable number.

221210001221001 is a deficient number, since it is larger than the sum of its proper divisors (100085827777143).

221210001221001 is a wasteful number, since it uses less digits than its factorization.

221210001221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21294.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221210001221001 its reverse (100122100012122), we get a palindrome (321332101233123).

The spelling of 221210001221001 in words is "two hundred twenty-one trillion, two hundred ten billion, one million, two hundred twenty-one thousand, one".