2012112021221 has 4 divisors (see below), whose sum is σ = 2012646166752. Its totient is φ = 2011577875692.

The previous prime is 2012112021197. The next prime is 2012112021233. The reversal of 2012112021221 is 1221202112102.

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.

It is a cyclic number.

It is not a de Polignac number, because 2012112021221 - 2³⁸ = 1737234114277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2012112021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012112021251) 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, 267067115 + ... + 267074648.

It is an arithmetic number, because the mean of its divisors is an integer number (503161541688).

Almost surely, 2^{2012112021221} is an apocalyptic number.

It is an amenable number.

2012112021221 is a deficient number, since it is larger than the sum of its proper divisors (534145531).

2012112021221 is an equidigital number, since it uses as much as digits as its factorization.

2012112021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534145530.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2012112021221 its reverse (1221202112102), we get a palindrome (3233314133323).

The spelling of 2012112021221 in words is "two trillion, twelve billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".