2012022021221 has 8 divisors (see below), whose sum is σ = 2047207344600. Its totient is φ = 1976907709440.

The previous prime is 2012022021167. The next prime is 2012022021223. The reversal of 2012022021221 is 1221202202102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 114683822500 + 1897338198721 = 338650^2 + 1377439^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2012022021221 is a prime.

It is a super-2 number, since 2×2012022021221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2012022021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012022021223) 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, 17695736 + ... + 17809073.

It is an arithmetic number, because the mean of its divisors is an integer number (255900918075).

Almost surely, 2^{2012022021221} is an apocalyptic number.

It is an amenable number.

2012022021221 is a deficient number, since it is larger than the sum of its proper divisors (35185323379).

2012022021221 is an equidigital number, since it uses as much as digits as its factorization.

2012022021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35505799.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2012022021221 its reverse (1221202202102), we get a palindrome (3233224223323).

The spelling of 2012022021221 in words is "two trillion, twelve billion, twenty-two million, twenty-one thousand, two hundred twenty-one".