122404125525221 has 4 divisors (see below), whose sum is σ = 122406712467852. Its totient is φ = 122401538582592.

The previous prime is 122404125525217. The next prime is 122404125525229. The reversal of 122404125525221 is 122525521404221.

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 79750347393025 + 42653778132196 = 8930305^2 + 6530986^2 .

It is a cyclic number.

It is not a de Polignac number, because 122404125525221 - 2² = 122404125525217 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 (122404125525229) 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, 1293400340 + ... + 1293494973.

It is an arithmetic number, because the mean of its divisors is an integer number (30601678116963).

Almost surely, 2^{122404125525221} is an apocalyptic number.

It is an amenable number.

122404125525221 is a deficient number, since it is larger than the sum of its proper divisors (2586942631).

122404125525221 is an equidigital number, since it uses as much as digits as its factorization.

122404125525221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586942630.

The product of its (nonzero) digits is 128000, while the sum is 38.

Adding to 122404125525221 its reverse (122525521404221), we get a palindrome (244929646929442).

The spelling of 122404125525221 in words is "one hundred twenty-two trillion, four hundred four billion, one hundred twenty-five million, five hundred twenty-five thousand, two hundred twenty-one".