122021221 has 10 divisors (see below), whose sum is σ = 142352422. Its totient is φ = 104587560.

The previous prime is 122021213. The next prime is 122021243. The reversal of 122021221 is 122120221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 121550625 + 470596 = 11025^2 + 686^2 .

It is not a de Polignac number, because 122021221 - 2³ = 122021213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122021201) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 23010 + ... + 27811.

Almost surely, 2^122021221 is an apocalyptic number.

It is an amenable number.

122021221 is a deficient number, since it is larger than the sum of its proper divisors (20331201).

122021221 is an frugal number, since it uses more digits than its factorization.

122021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50849 (or 50828 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 122021221 is about 11046.3216049507. The cubic root of 122021221 is about 495.9963213502.

Adding to 122021221 its reverse (122120221), we get a palindrome (244141442).

The spelling of 122021221 in words is "one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".