20012201201221 has 4 divisors (see below), whose sum is σ = 20012212851552. Its totient is φ = 20012189550892.

The previous prime is 20012201201219. The next prime is 20012201201281. The reversal of 20012201201221 is 12210210221002.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20012201201221 - 2¹ = 20012201201219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012201201195 and 20012201201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012201201281) 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, 2683915 + ... + 6872248.

It is an arithmetic number, because the mean of its divisors is an integer number (5003053212888).

Almost surely, 2^{20012201201221} is an apocalyptic number.

It is an amenable number.

20012201201221 is a deficient number, since it is larger than the sum of its proper divisors (11650331).

20012201201221 is an equidigital number, since it uses as much as digits as its factorization.

20012201201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11650330.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20012201201221 its reverse (12210210221002), we get a palindrome (32222411422223).

The spelling of 20012201201221 in words is "twenty trillion, twelve billion, two hundred one million, two hundred one thousand, two hundred twenty-one".