201220201001221 has 4 divisors (see below), whose sum is σ = 201220235011744. Its totient is φ = 201220166990700.

The previous prime is 201220201001203. The next prime is 201220201001453. The reversal of 201220201001221 is 122100102022102.

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 201220201001221 - 2¹³ = 201220200993029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201220201001195 and 201220201001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220201001821) 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, 5565315 + ... + 20818576.

It is an arithmetic number, because the mean of its divisors is an integer number (50305058752936).

Almost surely, 2^{201220201001221} is an apocalyptic number.

It is an amenable number.

201220201001221 is a deficient number, since it is larger than the sum of its proper divisors (34010523).

201220201001221 is an equidigital number, since it uses as much as digits as its factorization.

201220201001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34010522.

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

Adding to 201220201001221 its reverse (122100102022102), we get a palindrome (323320303023323).

The spelling of 201220201001221 in words is "two hundred one trillion, two hundred twenty billion, two hundred one million, one thousand, two hundred twenty-one".