201021022221221 has 8 divisors (see below), whose sum is σ = 212866367148864. Its totient is φ = 189177963839680.

The previous prime is 201021022221197. The next prime is 201021022221277. The reversal of 201021022221221 is 122122220120102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201021022221221 - 2¹⁸ = 201021021959077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021022221193 and 201021022221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021022211221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571455515 + ... + 571807176.

It is an arithmetic number, because the mean of its divisors is an integer number (26608295893608).

Almost surely, 2^{201021022221221} is an apocalyptic number.

It is an amenable number.

201021022221221 is a deficient number, since it is larger than the sum of its proper divisors (11845344927643).

201021022221221 is a wasteful number, since it uses less digits than its factorization.

201021022221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143273051.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 201021022221221 its reverse (122122220120102), we get a palindrome (323143242341323).

The spelling of 201021022221221 in words is "two hundred one trillion, twenty-one billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".