201121022221 has 8 divisors (see below), whose sum is σ = 241950102080. Its totient is φ = 163316318688.

The previous prime is 201121022177. The next prime is 201121022243. The reversal of 201121022221 is 122220121102.

It is a happy number.

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 201121022221 - 2¹⁹ = 201120497933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121022195 and 201121022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121022251) 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, 756093936 + ... + 756094201.

It is an arithmetic number, because the mean of its divisors is an integer number (30243762760).

Almost surely, 2^201121022221 is an apocalyptic number.

It is an amenable number.

201121022221 is a deficient number, since it is larger than the sum of its proper divisors (40829079859).

201121022221 is a wasteful number, since it uses less digits than its factorization.

201121022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512188163.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201121022221 its reverse (122220121102), we get a palindrome (323341143323).

The spelling of 201121022221 in words is "two hundred one billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".