201001200020021 has 4 divisors (see below), whose sum is σ = 201002281735500. Its totient is φ = 201000118304544.

The previous prime is 201001200019969. The next prime is 201001200020039. The reversal of 201001200020021 is 120020002100102.

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 73594333893796 + 127406866126225 = 8578714^2 + 11287465^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001200020021 - 2²⁶ = 201001132911157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201001200019984 and 201001200020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001200020051) 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, 540578966 + ... + 540950663.

It is an arithmetic number, because the mean of its divisors is an integer number (50250570433875).

Almost surely, 2^{201001200020021} is an apocalyptic number.

It is an amenable number.

201001200020021 is a deficient number, since it is larger than the sum of its proper divisors (1081715479).

201001200020021 is a wasteful number, since it uses less digits than its factorization.

201001200020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081715478.

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

Adding to 201001200020021 its reverse (120020002100102), we get a palindrome (321021202120123).

The spelling of 201001200020021 in words is "two hundred one trillion, one billion, two hundred million, twenty thousand, twenty-one".