221001020001 has 32 divisors (see below), whose sum is σ = 332849747840. Its totient is φ = 144886708800.

The previous prime is 221001019969. The next prime is 221001020039. The reversal of 221001020001 is 100020100122.

It is not a de Polignac number, because 221001020001 - 2⁵ = 221001019969 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001020701) 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, 9179886 + ... + 9203928.

It is an arithmetic number, because the mean of its divisors is an integer number (10401554620).

Almost surely, 2^221001020001 is an apocalyptic number.

It is an amenable number.

221001020001 is a deficient number, since it is larger than the sum of its proper divisors (111848727839).

221001020001 is a wasteful number, since it uses less digits than its factorization.

221001020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29694 (or 29688 counting only the distinct ones).

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

Adding to 221001020001 its reverse (100020100122), we get a palindrome (321021120123).

The spelling of 221001020001 in words is "two hundred twenty-one billion, one million, twenty thousand, one".