122001220021 has 4 divisors (see below), whose sum is σ = 122001961312. Its totient is φ = 122000478732.

The previous prime is 122001219961. The next prime is 122001220049. The reversal of 122001220021 is 120022100221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 122001220021 - 2²⁹ = 121464349109 is a prime.

It is a super-2 number, since 2×122001220021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122001219983 and 122001220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122001220421) 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, 681 + ... + 493966.

It is an arithmetic number, because the mean of its divisors is an integer number (30500490328).

Almost surely, 2^122001220021 is an apocalyptic number.

It is an amenable number.

122001220021 is a deficient number, since it is larger than the sum of its proper divisors (741291).

122001220021 is an equidigital number, since it uses as much as digits as its factorization.

122001220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741290.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 122001220021 its reverse (120022100221), we get a palindrome (242023320242).

The spelling of 122001220021 in words is "one hundred twenty-two billion, one million, two hundred twenty thousand, twenty-one".