221200010001 has 32 divisors (see below), whose sum is σ = 332241696000. Its totient is φ = 147247863984.

The previous prime is 221200009993. The next prime is 221200010027. The reversal of 221200010001 is 100010002122.

It is not a de Polignac number, because 221200010001 - 2³ = 221200009993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

221200010001 is a modest number, since divided by 10001 gives 2212 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221200010201) 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, 1405900 + ... + 1555298.

It is an arithmetic number, because the mean of its divisors is an integer number (10382553000).

Almost surely, 2^221200010001 is an apocalyptic number.

It is an amenable number.

221200010001 is a deficient number, since it is larger than the sum of its proper divisors (111041685999).

221200010001 is an frugal number, since it uses more digits than its factorization.

221200010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150097 (or 150079 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 221200010001 its reverse (100010002122), we get a palindrome (321210012123).

The spelling of 221200010001 in words is "two hundred twenty-one billion, two hundred million, ten thousand, one".