20201211001001 has 4 divisors (see below), whose sum is σ = 20212814225604. Its totient is φ = 20189607776400.

The previous prime is 20201211000983. The next prime is 20201211001003. The reversal of 20201211001001 is 10010011210202.

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 2760765018025 + 17440445982976 = 1661555^2 + 4176176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201211001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201211001003) 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, 5801609690 + ... + 5801613171.

It is an arithmetic number, because the mean of its divisors is an integer number (5053203556401).

Almost surely, 2^{20201211001001} is an apocalyptic number.

It is an amenable number.

20201211001001 is a deficient number, since it is larger than the sum of its proper divisors (11603224603).

20201211001001 is a wasteful number, since it uses less digits than its factorization.

20201211001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11603224602.

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

Adding to 20201211001001 its reverse (10010011210202), we get a palindrome (30211222211203).

The spelling of 20201211001001 in words is "twenty trillion, two hundred one billion, two hundred eleven million, one thousand, one".