20123202044221 has 4 divisors (see below), whose sum is σ = 20123282825244. Its totient is φ = 20123121263200.

The previous prime is 20123202044213. The next prime is 20123202044249. The reversal of 20123202044221 is 12244020232102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7405854676900 + 12717347367321 = 2721370^2 + 3566139^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123202044221 - 2³ = 20123202044213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123202074221) 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, 40015690 + ... + 40515451.

It is an arithmetic number, because the mean of its divisors is an integer number (5030820706311).

Almost surely, 2^{20123202044221} is an apocalyptic number.

It is an amenable number.

20123202044221 is a deficient number, since it is larger than the sum of its proper divisors (80781023).

20123202044221 is an equidigital number, since it uses as much as digits as its factorization.

20123202044221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80781022.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 20123202044221 its reverse (12244020232102), we get a palindrome (32367222276323).

The spelling of 20123202044221 in words is "twenty trillion, one hundred twenty-three billion, two hundred two million, forty-four thousand, two hundred twenty-one".