20012021020001 has 4 divisors (see below), whose sum is σ = 20552886453012. Its totient is φ = 19471155586992.

The previous prime is 20012021019983. The next prime is 20012021020039. The reversal of 20012021020001 is 10002012021002.

It is a happy number.

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 13882509653776 + 6129511366225 = 3725924^2 + 2475785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012021020001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012021020601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270432716450 + ... + 270432716523.

It is an arithmetic number, because the mean of its divisors is an integer number (5138221613253).

Almost surely, 2^{20012021020001} is an apocalyptic number.

It is an amenable number.

20012021020001 is a deficient number, since it is larger than the sum of its proper divisors (540865433011).

20012021020001 is an equidigital number, since it uses as much as digits as its factorization.

20012021020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540865433010.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20012021020001 its reverse (10002012021002), we get a palindrome (30014033041003).

It can be divided in two parts, 2001202 and 1020001, that added together give a palindrome (3021203).

The spelling of 20012021020001 in words is "twenty trillion, twelve billion, twenty-one million, twenty thousand, one".