2021100090 has 16 divisors (see below), whose sum is σ = 4850640288. Its totient is φ = 538960016.

The previous prime is 2021100089. The next prime is 2021100121. The reversal of 2021100090 is 900011202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 33684972 + ... + 33685031.

It is an arithmetic number, because the mean of its divisors is an integer number (303165018).

Almost surely, 2^2021100090 is an apocalyptic number.

2021100090 is an abundant number, since it is smaller than the sum of its proper divisors (2829540198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021100090 is a wasteful number, since it uses less digits than its factorization.

2021100090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67370013.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 2021100090 is about 44956.6467833178. The cubic root of 2021100090 is about 1264.3363003339.

Adding to 2021100090 its reverse (900011202), we get a palindrome (2921111292).

The spelling of 2021100090 in words is "two billion, twenty-one million, one hundred thousand, ninety".