221011201001 has 4 divisors (see below), whose sum is σ = 223076726352. Its totient is φ = 218945675652.

The previous prime is 221011200997. The next prime is 221011201003. The reversal of 221011201001 is 100102110122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221011201001 - 2² = 221011200997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011201003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1032762515 + ... + 1032762728.

It is an arithmetic number, because the mean of its divisors is an integer number (55769181588).

Almost surely, 2^221011201001 is an apocalyptic number.

It is an amenable number.

221011201001 is a deficient number, since it is larger than the sum of its proper divisors (2065525351).

221011201001 is a wasteful number, since it uses less digits than its factorization.

221011201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065525350.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221011201001 its reverse (100102110122), we get a palindrome (321113311123).

The spelling of 221011201001 in words is "two hundred twenty-one billion, eleven million, two hundred one thousand, one".