2012121 has 10 divisors (see below), whose sum is σ = 3005882. Its totient is φ = 1341360.

The previous prime is 2012113. The next prime is 2012123. The reversal of 2012121 is 1212102.

It can be written as a sum of positive squares in only one way, i.e., 1265625 + 746496 = 1125^2 + 864^2 .

It is not a de Polignac number, because 2012121 - 2³ = 2012113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2012123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12340 + ... + 12501.

2^2012121 is an apocalyptic number.

It is an amenable number.

2012121 is a deficient number, since it is larger than the sum of its proper divisors (993761).

2012121 is an equidigital number, since it uses as much as digits as its factorization.

2012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24853 (or 24844 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2012121 is about 1418.4925096736. The cubic root of 2012121 is about 126.2461175815.

Adding to 2012121 its reverse (1212102), we get a palindrome (3224223).

The spelling of 2012121 in words is "two million, twelve thousand, one hundred twenty-one".