11211020221001 has 4 divisors (see below), whose sum is σ = 11211343070100. Its totient is φ = 11210697371904.

The previous prime is 11211020220997. The next prime is 11211020221003. The reversal of 11211020221001 is 10012202011211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 743692365376 + 10467327855625 = 862376^2 + 3235325^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211020221001 - 2² = 11211020220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211020221003) 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, 161372456 + ... + 161441913.

It is an arithmetic number, because the mean of its divisors is an integer number (2802835767525).

Almost surely, 2^{11211020221001} is an apocalyptic number.

It is an amenable number.

11211020221001 is a deficient number, since it is larger than the sum of its proper divisors (322849099).

11211020221001 is an equidigital number, since it uses as much as digits as its factorization.

11211020221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322849098.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11211020221001 its reverse (10012202011211), we get a palindrome (21223222232212).

The spelling of 11211020221001 in words is "eleven trillion, two hundred eleven billion, twenty million, two hundred twenty-one thousand, one".