20010211221001 has 4 divisors (see below), whose sum is σ = 20017118442132. Its totient is φ = 20003303999872.

The previous prime is 20010211220963. The next prime is 20010211221043. The reversal of 20010211221001 is 10012211201002.

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 3403567455376 + 16606643765625 = 1844876^2 + 4075125^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010211221001 - 2²⁹ = 20009674350089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010211251001) 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, 3453606220 + ... + 3453612013.

It is an arithmetic number, because the mean of its divisors is an integer number (5004279610533).

Almost surely, 2^{20010211221001} is an apocalyptic number.

It is an amenable number.

20010211221001 is a deficient number, since it is larger than the sum of its proper divisors (6907221131).

20010211221001 is an equidigital number, since it uses as much as digits as its factorization.

20010211221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6907221130.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20010211221001 its reverse (10012211201002), we get a palindrome (30022422422003).

The spelling of 20010211221001 in words is "twenty trillion, ten billion, two hundred eleven million, two hundred twenty-one thousand, one".