2021012120 has 32 divisors (see below), whose sum is σ = 4615153200. Its totient is φ = 796338048.

The previous prime is 2021012111. The next prime is 2021012129. The reversal of 2021012120 is 212101202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021012111) and next prime (2021012129).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021012129) 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, 374375 + ... + 379734.

Almost surely, 2^2021012120 is an apocalyptic number.

2021012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021012120 is an abundant number, since it is smaller than the sum of its proper divisors (2594141080).

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

2021012120 is a wasteful number, since it uses less digits than its factorization.

2021012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754187 (or 754183 counting only the distinct ones).

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

The square root of 2021012120 is about 44955.6683856441. The cubic root of 2021012120 is about 1264.3179563177.

Adding to 2021012120 its reverse (212101202), we get a palindrome (2233113322).

The spelling of 2021012120 in words is "two billion, twenty-one million, twelve thousand, one hundred twenty".