122020001021 has 4 divisors (see below), whose sum is σ = 122029843452. Its totient is φ = 122010158592.

The previous prime is 122020001017. The next prime is 122020001029. The reversal of 122020001021 is 120100020221.

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 36056692996 + 85963308025 = 189886^2 + 293195^2 .

It is a cyclic number.

It is not a de Polignac number, because 122020001021 - 2² = 122020001017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122020000993 and 122020001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122020001029) 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, 4902596 + ... + 4927421.

It is an arithmetic number, because the mean of its divisors is an integer number (30507460863).

Almost surely, 2^122020001021 is an apocalyptic number.

It is an amenable number.

122020001021 is a deficient number, since it is larger than the sum of its proper divisors (9842431).

122020001021 is an equidigital number, since it uses as much as digits as its factorization.

122020001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9842430.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 122020001021 its reverse (120100020221), we get a palindrome (242120021242).

The spelling of 122020001021 in words is "one hundred twenty-two billion, twenty million, one thousand, twenty-one".