201010100021 has 8 divisors (see below), whose sum is σ = 201725282304. Its totient is φ = 200295116560.

The previous prime is 201010099991. The next prime is 201010100063. The reversal of 201010100021 is 120001010102.

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 201010100021 - 2⁶ = 201010099957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201010099981 and 201010100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201010100321) 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, 2147876 + ... + 2239506.

It is an arithmetic number, because the mean of its divisors is an integer number (25215660288).

Almost surely, 2^201010100021 is an apocalyptic number.

It is an amenable number.

201010100021 is a deficient number, since it is larger than the sum of its proper divisors (715182283).

201010100021 is an equidigital number, since it uses as much as digits as its factorization.

201010100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99411.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 201010100021 its reverse (120001010102), we get a palindrome (321011110123).

The spelling of 201010100021 in words is "two hundred one billion, ten million, one hundred thousand, twenty-one".