2012012021221 has 16 divisors (see below), whose sum is σ = 2060243589888. Its totient is φ = 1964536537600.

The previous prime is 2012012021209. The next prime is 2012012021233. The reversal of 2012012021221 is 1221202102102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2012012021209) and next prime (2012012021233).

It is a cyclic number.

It is not a de Polignac number, because 2012012021221 - 2¹³ = 2012012013029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012012021195 and 2012012021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012012021821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1531956 + ... + 2524066.

It is an arithmetic number, because the mean of its divisors is an integer number (128765224368).

Almost surely, 2^{2012012021221} is an apocalyptic number.

It is an amenable number.

2012012021221 is a deficient number, since it is larger than the sum of its proper divisors (48231568667).

2012012021221 is a wasteful number, since it uses less digits than its factorization.

2012012021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992492.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2012012021221 its reverse (1221202102102), we get a palindrome (3233214123323).

The spelling of 2012012021221 in words is "two trillion, twelve billion, twelve million, twenty-one thousand, two hundred twenty-one".