2021000001 has 16 divisors (see below), whose sum is σ = 2881433088. Its totient is φ = 1255520000.

The previous prime is 2020999987. The next prime is 2021000017. The reversal of 2021000001 is 1000001202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2021000001 - 2⁵ = 2020999969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021001001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191025 + ... + 201326.

It is an arithmetic number, because the mean of its divisors is an integer number (180089568).

Almost surely, 2^2021000001 is an apocalyptic number.

It is an amenable number.

2021000001 is a deficient number, since it is larger than the sum of its proper divisors (860433087).

2021000001 is a wasteful number, since it uses less digits than its factorization.

2021000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392472.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 2021000001 is about 44955.5335971001. The cubic root of 2021000001 is about 1264.3154291516.

Adding to 2021000001 its reverse (1000001202), we get a palindrome (3021001203).

It can be divided in two parts, 202 and 1000001, that multiplied together give a palindrome (202000202).

The spelling of 2021000001 in words is "two billion, twenty-one million, one", and thus it is an aban number and an uban number.