122121201200021 has 8 divisors (see below), whose sum is σ = 126499162564920. Its totient is φ = 117754365532608.

The previous prime is 122121201199997. The next prime is 122121201200051. The reversal of 122121201200021 is 120002102121221.

It can be written as a sum of positive squares in 4 ways, for example, as 42000263139121 + 80120938060900 = 6480761^2 + 8951030^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122121201200021 - 2³⁸ = 121846323293077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121201200051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2781402026 + ... + 2781445931.

It is an arithmetic number, because the mean of its divisors is an integer number (15812395320615).

Almost surely, 2^{122121201200021} is an apocalyptic number.

It is an amenable number.

122121201200021 is a deficient number, since it is larger than the sum of its proper divisors (4377961364899).

122121201200021 is an equidigital number, since it uses as much as digits as its factorization.

122121201200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5562848743.

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

Adding to 122121201200021 its reverse (120002102121221), we get a palindrome (242123303321242).

The spelling of 122121201200021 in words is "one hundred twenty-two trillion, one hundred twenty-one billion, two hundred one million, two hundred thousand, twenty-one".