2012020121 has 4 divisors (see below), whose sum is σ = 2014819200. Its totient is φ = 2009221044.

The previous prime is 2012020093. The next prime is 2012020123. The reversal of 2012020121 is 1210202102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1210202102 = 2 ⋅605101051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2012020121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2012020123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1398461 + ... + 1399898.

It is an arithmetic number, because the mean of its divisors is an integer number (503704800).

Almost surely, 2^2012020121 is an apocalyptic number.

It is an amenable number.

2012020121 is a deficient number, since it is larger than the sum of its proper divisors (2799079).

2012020121 is an equidigital number, since it uses as much as digits as its factorization.

2012020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799078.

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

The square root of 2012020121 is about 44855.5472712127. The cubic root of 2012020121 is about 1262.4400773572.

Adding to 2012020121 its reverse (1210202102), we get a palindrome (3222222223).

The spelling of 2012020121 in words is "two billion, twelve million, twenty thousand, one hundred twenty-one".