122220021221021 has 4 divisors (see below), whose sum is σ = 122221300022844. Its totient is φ = 122218742419200.

The previous prime is 122220021220987. The next prime is 122220021221029. The reversal of 122220021221021 is 120122120022221.

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 108089000455396 + 14131020765625 = 10396586^2 + 3759125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122220021221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122220021220984 and 122220021221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122220021221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639257540 + ... + 639448701.

It is an arithmetic number, because the mean of its divisors is an integer number (30555325005711).

Almost surely, 2^{122220021221021} is an apocalyptic number.

It is an amenable number.

122220021221021 is a deficient number, since it is larger than the sum of its proper divisors (1278801823).

122220021221021 is an equidigital number, since it uses as much as digits as its factorization.

122220021221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278801822.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 122220021221021 its reverse (120122120022221), we get a palindrome (242342141243242).

The spelling of 122220021221021 in words is "one hundred twenty-two trillion, two hundred twenty billion, twenty-one million, two hundred twenty-one thousand, twenty-one".