2021021210999 has 16 divisors (see below), whose sum is σ = 2574321580800. Its totient is φ = 1544592945024.

The previous prime is 2021021210983. The next prime is 2021021211031. The reversal of 2021021210999 is 9990121201202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2021021210999 - 2⁴ = 2021021210983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021021210399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446928569 + ... + 446933090.

It is an arithmetic number, because the mean of its divisors is an integer number (160895098800).

Almost surely, 2^{2021021210999} is an apocalyptic number.

2021021210999 is a deficient number, since it is larger than the sum of its proper divisors (553300369801).

2021021210999 is a wasteful number, since it uses less digits than its factorization.

2021021210999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893861702.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 2021021210999 in words is "two trillion, twenty-one billion, twenty-one million, two hundred ten thousand, nine hundred ninety-nine".