20001012021001 has 4 divisors (see below), whose sum is σ = 21819285841104. Its totient is φ = 18182738200900.

The previous prime is 20001012020999. The next prime is 20001012021013. The reversal of 20001012021001 is 10012021010002.

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 20001012021001 - 2¹ = 20001012020999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001012021041) 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, 909136910035 + ... + 909136910056.

It is an arithmetic number, because the mean of its divisors is an integer number (5454821460276).

Almost surely, 2^{20001012021001} is an apocalyptic number.

It is an amenable number.

20001012021001 is a deficient number, since it is larger than the sum of its proper divisors (1818273820103).

20001012021001 is a wasteful number, since it uses less digits than its factorization.

20001012021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818273820102.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20001012021001 its reverse (10012021010002), we get a palindrome (30013033031003).

The spelling of 20001012021001 in words is "twenty trillion, one billion, twelve million, twenty-one thousand, one".