122112021200021 has 4 divisors (see below), whose sum is σ = 122645261467500. Its totient is φ = 121578780932544.

The previous prime is 122112021200003. The next prime is 122112021200041. The reversal of 122112021200021 is 120002120211221.

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 98230180720996 + 23881840479025 = 9911114^2 + 4886905^2 .

It is a cyclic number.

It is not a de Polignac number, because 122112021200021 - 2²⁶ = 122111954091157 is a prime.

It is a super-2 number, since 2×122112021200021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122112021200041) 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, 266620133396 + ... + 266620133853.

It is an arithmetic number, because the mean of its divisors is an integer number (30661315366875).

Almost surely, 2^{122112021200021} is an apocalyptic number.

It is an amenable number.

122112021200021 is a deficient number, since it is larger than the sum of its proper divisors (533240267479).

122112021200021 is an equidigital number, since it uses as much as digits as its factorization.

122112021200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533240267478.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 122112021200021 its reverse (120002120211221), we get a palindrome (242114141411242).

The spelling of 122112021200021 in words is "one hundred twenty-two trillion, one hundred twelve billion, twenty-one million, two hundred thousand, twenty-one".