201012021091 has 4 divisors (see below), whose sum is σ = 229728024112. Its totient is φ = 172296018072.

The previous prime is 201012021053. The next prime is 201012021101. The reversal of 201012021091 is 190120210102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201012021091 - 2²⁹ = 200475150179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201012021031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14358001500 + ... + 14358001513.

It is an arithmetic number, because the mean of its divisors is an integer number (57432006028).

Almost surely, 2^201012021091 is an apocalyptic number.

201012021091 is a deficient number, since it is larger than the sum of its proper divisors (28716003021).

201012021091 is an equidigital number, since it uses as much as digits as its factorization.

201012021091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28716003020.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 201012021091 its reverse (190120210102), we get a palindrome (391132231193).

The spelling of 201012021091 in words is "two hundred one billion, twelve million, twenty-one thousand, ninety-one".