221231210001 has 32 divisors (see below), whose sum is σ = 298177597440. Its totient is φ = 145895904000.

The previous prime is 221231209999. The next prime is 221231210009. The reversal of 221231210001 is 100012132122.

It is not a de Polignac number, because 221231210001 - 2¹ = 221231209999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221231210009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196999626 + ... + 197000748.

It is an arithmetic number, because the mean of its divisors is an integer number (9318049920).

Almost surely, 2^221231210001 is an apocalyptic number.

It is an amenable number.

221231210001 is a deficient number, since it is larger than the sum of its proper divisors (76946387439).

221231210001 is a wasteful number, since it uses less digits than its factorization.

221231210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221231210001 its reverse (100012132122), we get a palindrome (321243342123).

The spelling of 221231210001 in words is "two hundred twenty-one billion, two hundred thirty-one million, two hundred ten thousand, one".