2021009976 has 96 divisors (see below), whose sum is σ = 5685039360. Its totient is φ = 648115776.

The previous prime is 2021009957. The next prime is 2021009983. The reversal of 2021009976 is 6799001202.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2021009976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202561 + ... + 212303.

It is an arithmetic number, because the mean of its divisors is an integer number (59219160).

Almost surely, 2^2021009976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021009976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2842519680).

2021009976 is an abundant number, since it is smaller than the sum of its proper divisors (3664029384).

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

2021009976 is a wasteful number, since it uses less digits than its factorization.

2021009976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9865 (or 9858 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 2021009976 is about 44955.6445399240. The cubic root of 2021009976 is about 1264.3175092317.

The spelling of 2021009976 in words is "two billion, twenty-one million, nine thousand, nine hundred seventy-six".