201021100989 has 16 divisors (see below), whose sum is σ = 268748001984. Its totient is φ = 133654435200.

The previous prime is 201021100979. The next prime is 201021101027. The reversal of 201021100989 is 989001120102.

It is not a de Polignac number, because 201021100989 - 2⁸ = 201021100733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021100939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2719854 + ... + 2792784.

It is an arithmetic number, because the mean of its divisors is an integer number (16796750124).

Almost surely, 2^201021100989 is an apocalyptic number.

It is an amenable number.

201021100989 is a deficient number, since it is larger than the sum of its proper divisors (67726900995).

201021100989 is a wasteful number, since it uses less digits than its factorization.

201021100989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75388.

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 201021100989 in words is "two hundred one billion, twenty-one million, one hundred thousand, nine hundred eighty-nine".