20001201002021 has 8 divisors (see below), whose sum is σ = 21694272536664. Its totient is φ = 18365521722880.

The previous prime is 20001201002017. The next prime is 20001201002117. The reversal of 20001201002021 is 12020010210002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3754545652225 + 16246655349796 = 1937665^2 + 4030714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001201002021 - 2² = 20001201002017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001201001993 and 20001201002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001201002621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14348063150 + ... + 14348064543.

It is an arithmetic number, because the mean of its divisors is an integer number (2711784067083).

Almost surely, 2^{20001201002021} is an apocalyptic number.

It is an amenable number.

20001201002021 is a deficient number, since it is larger than the sum of its proper divisors (1693071534643).

20001201002021 is a wasteful number, since it uses less digits than its factorization.

20001201002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28696127751.

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

Adding to 20001201002021 its reverse (12020010210002), we get a palindrome (32021211212023).

The spelling of 20001201002021 in words is "twenty trillion, one billion, two hundred one million, two thousand, twenty-one".