201020211221 has 8 divisors (see below), whose sum is σ = 207961990488. Its totient is φ = 194175520000.

The previous prime is 201020211103. The next prime is 201020211277. The reversal of 201020211221 is 122112020102.

It can be written as a sum of positive squares in 4 ways, for example, as 31182262225 + 169837948996 = 176585^2 + 412114^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201020211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201020211196 and 201020211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020211281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24267800 + ... + 24276081.

It is an arithmetic number, because the mean of its divisors is an integer number (25995248811).

Almost surely, 2^201020211221 is an apocalyptic number.

It is an amenable number.

201020211221 is a deficient number, since it is larger than the sum of its proper divisors (6941779267).

201020211221 is a wasteful number, since it uses less digits than its factorization.

201020211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48544023.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201020211221 its reverse (122112020102), we get a palindrome (323132231323).

The spelling of 201020211221 in words is "two hundred one billion, twenty million, two hundred eleven thousand, two hundred twenty-one".