20200201221221 has 4 divisors (see below), whose sum is σ = 23085944252832. Its totient is φ = 17314458189612.

The previous prime is 20200201221217. The next prime is 20200201221241. The reversal of 20200201221221 is 12212210200202.

It is a happy number.

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 20200201221221 - 2² = 20200201221217 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 20200201221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200201221241) 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, 1442871515795 + ... + 1442871515808.

It is an arithmetic number, because the mean of its divisors is an integer number (5771486063208).

Almost surely, 2^{20200201221221} is an apocalyptic number.

It is an amenable number.

20200201221221 is a deficient number, since it is larger than the sum of its proper divisors (2885743031611).

20200201221221 is an equidigital number, since it uses as much as digits as its factorization.

20200201221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885743031610.

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

Adding to 20200201221221 its reverse (12212210200202), we get a palindrome (32412411421423).

The spelling of 20200201221221 in words is "twenty trillion, two hundred billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".