2021011121985 has 16 divisors (see below), whose sum is σ = 3241681689600. Its totient is φ = 1075184633600.

The previous prime is 2021011121953. The next prime is 2021011121989. The reversal of 2021011121985 is 5891211101202.

It is not a de Polignac number, because 2021011121985 - 2⁵ = 2021011121953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021011121989) 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, 167991585 + ... + 168003614.

It is an arithmetic number, because the mean of its divisors is an integer number (202605105600).

Almost surely, 2^{2021011121985} is an apocalyptic number.

It is an amenable number.

2021011121985 is a deficient number, since it is larger than the sum of its proper divisors (1220670567615).

2021011121985 is a wasteful number, since it uses less digits than its factorization.

2021011121985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335995608.

The product of its (nonzero) digits is 2880, while the sum is 33.

The spelling of 2021011121985 in words is "two trillion, twenty-one billion, eleven million, one hundred twenty-one thousand, nine hundred eighty-five".