2021011121988 has 36 divisors (see below), whose sum is σ = 5108812159360. Its totient is φ = 673651232496.

The previous prime is 2021011121953. The next prime is 2021011121989. The reversal of 2021011121988 is 8891211101202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 516693 + ... + 2075811.

Almost surely, 2^{2021011121988} is an apocalyptic number.

It is an amenable number.

2021011121988 is an abundant number, since it is smaller than the sum of its proper divisors (3087801037372).

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

2021011121988 is a wasteful number, since it uses less digits than its factorization.

2021011121988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595136 (or 1595131 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The spelling of 2021011121988 in words is "two trillion, twenty-one billion, eleven million, one hundred twenty-one thousand, nine hundred eighty-eight".