122121405 has 32 divisors (see below), whose sum is σ = 248121600. Its totient is φ = 55826496.

The previous prime is 122121383. The next prime is 122121413. The reversal of 122121405 is 504121221.

It is not a de Polignac number, because 122121405 - 2¹² = 122117309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63670 + ... + 65559.

It is an arithmetic number, because the mean of its divisors is an integer number (7753800).

Almost surely, 2^122121405 is an apocalyptic number.

122121405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

122121405 is an abundant number, since it is smaller than the sum of its proper divisors (126000195).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122121405 is a wasteful number, since it uses less digits than its factorization.

122121405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129250 (or 129244 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 122121405 is about 11050.8553967555. The cubic root of 122121405 is about 496.1320280791.

Adding to 122121405 its reverse (504121221), we get a palindrome (626242626).

The spelling of 122121405 in words is "one hundred twenty-two million, one hundred twenty-one thousand, four hundred five".