2021002021 has 16 divisors (see below), whose sum is σ = 2133128448. Its totient is φ = 1912680000.

The previous prime is 2021001977. The next prime is 2021002031. The reversal of 2021002021 is 1202001202.

It is a cyclic number.

It is not a de Polignac number, because 2021002021 - 2⁷ = 2021001893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021001989 and 2021002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021002031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199171 + ... + 209071.

It is an arithmetic number, because the mean of its divisors is an integer number (133320528).

Almost surely, 2^2021002021 is an apocalyptic number.

It is an amenable number.

2021002021 is a deficient number, since it is larger than the sum of its proper divisors (112126427).

2021002021 is a wasteful number, since it uses less digits than its factorization.

2021002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10092.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2021002021 is about 44955.5560637392. The cubic root of 2021002021 is about 1264.3158503814.

Adding to 2021002021 its reverse (1202001202), we get a palindrome (3223003223).

It can be divided in two parts, 202100 and 2021, that multiplied together give a square (408444100 = 20210²).

The spelling of 2021002021 in words is "two billion, twenty-one million, two thousand, twenty-one".