122221220021 has 4 divisors (see below), whose sum is σ = 123302823852. Its totient is φ = 121139616192.

The previous prime is 122221219999. The next prime is 122221220053. The reversal of 122221220021 is 120022122221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120022122221 = 349 ⋅343902929.

It can be written as a sum of positive squares in 2 ways, for example, as 66763324996 + 55457895025 = 258386^2 + 235495^2 .

It is a cyclic number.

It is not a de Polignac number, because 122221220021 - 2³⁴ = 105041350837 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 (122221222021) 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, 540801746 + ... + 540801971.

It is an arithmetic number, because the mean of its divisors is an integer number (30825705963).

Almost surely, 2^122221220021 is an apocalyptic number.

It is an amenable number.

122221220021 is a deficient number, since it is larger than the sum of its proper divisors (1081603831).

122221220021 is a wasteful number, since it uses less digits than its factorization.

122221220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081603830.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 122221220021 its reverse (120022122221), we get a palindrome (242243342242).

The spelling of 122221220021 in words is "one hundred twenty-two billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".