2012121021 has 8 divisors (see below), whose sum is σ = 2684415744. Its totient is φ = 1340620160.

The previous prime is 2012121017. The next prime is 2012121031. The reversal of 2012121021 is 1201212102.

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

It is a cyclic number.

It is not a de Polignac number, because 2012121021 - 2² = 2012121017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2012120988 and 2012121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012121011) 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, 192525 + ... + 202706.

It is an arithmetic number, because the mean of its divisors is an integer number (335551968).

Almost surely, 2^2012121021 is an apocalyptic number.

It is an amenable number.

2012121021 is a deficient number, since it is larger than the sum of its proper divisors (672294723).

2012121021 is a wasteful number, since it uses less digits than its factorization.

2012121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396931.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2012121021 is about 44856.6719786477. The cubic root of 2012121021 is about 1262.4611802069.

Adding to 2012121021 its reverse (1201212102), we get a palindrome (3213333123).

The spelling of 2012121021 in words is "two billion, twelve million, one hundred twenty-one thousand, twenty-one".