201021221321 has 4 divisors (see below), whose sum is σ = 202899924432. Its totient is φ = 199142518212.

The previous prime is 201021221311. The next prime is 201021221333. The reversal of 201021221321 is 123122120102.

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 201021221321 - 2³⁴ = 183841352137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201021221321.

It is not an unprimeable number, because it can be changed into a prime (201021221311) 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, 939351395 + ... + 939351608.

It is an arithmetic number, because the mean of its divisors is an integer number (50724981108).

Almost surely, 2^201021221321 is an apocalyptic number.

It is an amenable number.

201021221321 is a deficient number, since it is larger than the sum of its proper divisors (1878703111).

201021221321 is a wasteful number, since it uses less digits than its factorization.

201021221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878703110.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 201021221321 its reverse (123122120102), we get a palindrome (324143341423).

The spelling of 201021221321 in words is "two hundred one billion, twenty-one million, two hundred twenty-one thousand, three hundred twenty-one".