2021456844 has 192 divisors, whose sum is σ = 6015098880. Its totient is φ = 581106240.

The previous prime is 2021456839. The next prime is 2021456849. The reversal of 2021456844 is 4486541202.

2021456844 = T₄₆₇ + T₄₆₈ + ... + T₂₃₀₃.

It is an interprime number because it is at equal distance from previous prime (2021456839) and next prime (2021456849).

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

It is a junction number, because it is equal to n+sod(n) for n = 2021456799 and 2021456808.

It is not an unprimeable number, because it can be changed into a prime (2021456849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4562887 + ... + 4563329.

It is an arithmetic number, because the mean of its divisors is an integer number (31328640).

Almost surely, 2^2021456844 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 2021456844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3007549440).

2021456844 is an abundant number, since it is smaller than the sum of its proper divisors (3993642036).

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

2021456844 is a wasteful number, since it uses less digits than its factorization.

2021456844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 36.

The square root of 2021456844 is about 44960.6143641299. The cubic root of 2021456844 is about 1264.4106872973.

The spelling of 2021456844 in words is "two billion, twenty-one million, four hundred fifty-six thousand, eight hundred forty-four".