20012212101221 has 8 divisors (see below), whose sum is σ = 20086455836280. Its totient is φ = 19937982737088.

The previous prime is 20012212101191. The next prime is 20012212101229. The reversal of 20012212101221 is 12210121221002.

It can be written as a sum of positive squares in 4 ways, for example, as 580743064225 + 19431469036996 = 762065^2 + 4408114^2 .

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-20012212101221 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 20012212101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012212101229) 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, 798446 + ... + 6376671.

It is an arithmetic number, because the mean of its divisors is an integer number (2510806979535).

Almost surely, 2^{20012212101221} is an apocalyptic number.

It is an amenable number.

20012212101221 is a deficient number, since it is larger than the sum of its proper divisors (74243735059).

20012212101221 is a wasteful number, since it uses less digits than its factorization.

20012212101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7185463.

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

Adding to 20012212101221 its reverse (12210121221002), we get a palindrome (32222333322223).

The spelling of 20012212101221 in words is "twenty trillion, twelve billion, two hundred twelve million, one hundred one thousand, two hundred twenty-one".