121620215405 has 48 divisors (see below), whose sum is σ = 163353447936. Its totient is φ = 86796852480.

The previous prime is 121620215393. The next prime is 121620215407. The reversal of 121620215405 is 504512026121.

It is not a de Polignac number, because 121620215405 - 2⁸ = 121620215149 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 (121620215407) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 22341614 + ... + 22347056.

It is an arithmetic number, because the mean of its divisors is an integer number (3403196832).

Almost surely, 2^121620215405 is an apocalyptic number.

It is an amenable number.

121620215405 is a deficient number, since it is larger than the sum of its proper divisors (41733232531).

121620215405 is a wasteful number, since it uses less digits than its factorization.

121620215405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6358 (or 6345 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 121620215405 in words is "one hundred twenty-one billion, six hundred twenty million, two hundred fifteen thousand, four hundred five".