2021012021 has 8 divisors (see below), whose sum is σ = 2311411584. Its totient is φ = 1731033360.

The previous prime is 2021012009. The next prime is 2021012033. The reversal of 2021012021 is 1202101202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021012009) and next prime (2021012033).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021012021 - 2¹⁰ = 2021010997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021011993 and 2021012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021017021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94865 + ... + 114198.

It is an arithmetic number, because the mean of its divisors is an integer number (288926448).

Almost surely, 2^2021012021 is an apocalyptic number.

It is an amenable number.

2021012021 is a deficient number, since it is larger than the sum of its proper divisors (290399563).

2021012021 is a wasteful number, since it uses less digits than its factorization.

2021012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210451.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2021012021 is about 44955.6672845594. The cubic root of 2021012021 is about 1264.3179356734.

Adding to 2021012021 its reverse (1202101202), we get a palindrome (3223113223).

The spelling of 2021012021 in words is "two billion, twenty-one million, twelve thousand, twenty-one".