201101010020021 has 4 divisors (see below), whose sum is σ = 205379754914112. Its totient is φ = 196822265125932.

The previous prime is 201101010019979. The next prime is 201101010020039. The reversal of 201101010020021 is 120020010101102.

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 201101010020021 - 2⁶ = 201101010019957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201101010019984 and 201101010020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201101010020051) 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, 2139372446975 + ... + 2139372447068.

It is an arithmetic number, because the mean of its divisors is an integer number (51344938728528).

Almost surely, 2^{201101010020021} is an apocalyptic number.

It is an amenable number.

201101010020021 is a deficient number, since it is larger than the sum of its proper divisors (4278744894091).

201101010020021 is an equidigital number, since it uses as much as digits as its factorization.

201101010020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278744894090.

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

Adding to 201101010020021 its reverse (120020010101102), we get a palindrome (321121020121123).

The spelling of 201101010020021 in words is "two hundred one trillion, one hundred one billion, ten million, twenty thousand, twenty-one".