122220002021 has 4 divisors (see below), whose sum is σ = 131621540652. Its totient is φ = 112818463392.

The previous prime is 122220001993. The next prime is 122220002033. The reversal of 122220002021 is 120200022221.

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 17289357121 + 104930644900 = 131489^2 + 323930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122220002021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 122220001987 and 122220002005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122220005021) 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, 4700769296 + ... + 4700769321.

It is an arithmetic number, because the mean of its divisors is an integer number (32905385163).

Almost surely, 2^122220002021 is an apocalyptic number.

It is an amenable number.

122220002021 is a deficient number, since it is larger than the sum of its proper divisors (9401538631).

122220002021 is an equidigital number, since it uses as much as digits as its factorization.

122220002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9401538630.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 122220002021 its reverse (120200022221), we get a palindrome (242420024242).

The spelling of 122220002021 in words is "one hundred twenty-two billion, two hundred twenty million, two thousand, twenty-one".