201201222220021 has 4 divisors (see below), whose sum is σ = 204611412427200. Its totient is φ = 197791032012844.

The previous prime is 201201222220013. The next prime is 201201222220067. The reversal of 201201222220021 is 120022222102102.

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 201201222220021 - 2³ = 201201222220013 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 (201201222220091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1705095103501 + ... + 1705095103618.

It is an arithmetic number, because the mean of its divisors is an integer number (51152853106800).

Almost surely, 2^{201201222220021} is an apocalyptic number.

It is an amenable number.

201201222220021 is a deficient number, since it is larger than the sum of its proper divisors (3410190207179).

201201222220021 is an equidigital number, since it uses as much as digits as its factorization.

201201222220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410190207178.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 201201222220021 its reverse (120022222102102), we get a palindrome (321223444322123).

The spelling of 201201222220021 in words is "two hundred one trillion, two hundred one billion, two hundred twenty-two million, two hundred twenty thousand, twenty-one".