2021001012 has 18 divisors (see below), whose sum is σ = 5108641538. Its totient is φ = 673666992.

The previous prime is 2021001001. The next prime is 2021001041. The reversal of 2021001012 is 2101001202.

It can be written as a sum of positive squares in only one way, i.e., 1191906576 + 829094436 = 34524^2 + 28794^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2021000985 and 2021001003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28069423 + ... + 28069494.

Almost surely, 2^2021001012 is an apocalyptic number.

It is an amenable number.

2021001012 is an abundant number, since it is smaller than the sum of its proper divisors (3087640526).

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

2021001012 is a wasteful number, since it uses less digits than its factorization.

2021001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56138927 (or 56138922 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2021001012 is about 44955.5448415432. The cubic root of 2021001012 is about 1264.3156399751.

Adding to 2021001012 its reverse (2101001202), we get a palindrome (4122002214).

The spelling of 2021001012 in words is "two billion, twenty-one million, one thousand, twelve".