221001200001 has 24 divisors (see below), whose sum is σ = 320414006016. Its totient is φ = 146785367040.

The previous prime is 221001199999. The next prime is 221001200003. The reversal of 221001200001 is 100002100122.

It is an interprime number because it is at equal distance from previous prime (221001199999) and next prime (221001200003).

It is not a de Polignac number, because 221001200001 - 2¹ = 221001199999 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (221001200003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5755201 + ... + 5793473.

It is an arithmetic number, because the mean of its divisors is an integer number (13350583584).

Almost surely, 2^221001200001 is an apocalyptic number.

It is an amenable number.

221001200001 is a deficient number, since it is larger than the sum of its proper divisors (99412806015).

221001200001 is a wasteful number, since it uses less digits than its factorization.

221001200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40653 (or 40650 counting only the distinct ones).

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

Adding to 221001200001 its reverse (100002100122), we get a palindrome (321003300123).

The spelling of 221001200001 in words is "two hundred twenty-one billion, one million, two hundred thousand, one".