201102021221 has 4 divisors (see below), whose sum is σ = 203093130444. Its totient is φ = 199110912000.

The previous prime is 201102021193. The next prime is 201102021229. The reversal of 201102021221 is 122120201102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 191362502500 + 9739518721 = 437450^2 + 98689^2 .

It is a cyclic number.

It is not a de Polignac number, because 201102021221 - 2¹⁸ = 201101759077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201102021196 and 201102021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201102021229) 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, 995554460 + ... + 995554661.

It is an arithmetic number, because the mean of its divisors is an integer number (50773282611).

Almost surely, 2^201102021221 is an apocalyptic number.

It is an amenable number.

201102021221 is a deficient number, since it is larger than the sum of its proper divisors (1991109223).

201102021221 is a wasteful number, since it uses less digits than its factorization.

201102021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991109222.

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

Adding to 201102021221 its reverse (122120201102), we get a palindrome (323222222323).

The spelling of 201102021221 in words is "two hundred one billion, one hundred two million, twenty-one thousand, two hundred twenty-one".