2021000000 has 196 divisors, whose sum is σ = 5238682944. Its totient is φ = 772800000.

The previous prime is 2020999987. The next prime is 2021000017. The reversal of 2021000000 is 1202.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 42999977 + ... + 43000023.

Almost surely, 2^2021000000 is an apocalyptic number.

2021000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2619341472).

2021000000 is an abundant number, since it is smaller than the sum of its proper divisors (3217682944).

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

2021000000 is an frugal number, since it uses more digits than its factorization.

2021000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 2021000000 is about 44955.5335859780. The cubic root of 2021000000 is about 1264.3154289431.

Adding to 2021000000 its reverse (1202), we get a palindrome (2021001202).

The spelling of 2021000000 in words is "two billion, twenty-one million", and thus it is an aban number and an uban number.