122210021221 has 4 divisors (see below), whose sum is σ = 124515870732. Its totient is φ = 119904171712.

The previous prime is 122210021183. The next prime is 122210021233. The reversal of 122210021221 is 122120012221.

It is a happy number.

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 83700276100 + 38509745121 = 289310^2 + 196239^2 .

It is a cyclic number.

It is not a de Polignac number, because 122210021221 - 2⁷ = 122210021093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122210021195 and 122210021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122210021251) 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, 1152924676 + ... + 1152924781.

It is an arithmetic number, because the mean of its divisors is an integer number (31128967683).

Almost surely, 2^122210021221 is an apocalyptic number.

It is an amenable number.

122210021221 is a deficient number, since it is larger than the sum of its proper divisors (2305849511).

122210021221 is an equidigital number, since it uses as much as digits as its factorization.

122210021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305849510.

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

Adding to 122210021221 its reverse (122120012221), we get a palindrome (244330033442).

The spelling of 122210021221 in words is "one hundred twenty-two billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".