405540230121 has 32 divisors (see below), whose sum is σ = 647080197120. Its totient is φ = 249538361472.

The previous prime is 405540230119. The next prime is 405540230129. The reversal of 405540230121 is 121032045504.

405540230121 is a `hidden beast` number, since 405 + 5 + 4 + 0 + 230 + 1 + 21 = 666.

It is not a de Polignac number, because 405540230121 - 2¹ = 405540230119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (405540230129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3848680 + ... + 3952646.

It is an arithmetic number, because the mean of its divisors is an integer number (20221256160).

Almost surely, 2^405540230121 is an apocalyptic number.

It is an amenable number.

405540230121 is a deficient number, since it is larger than the sum of its proper divisors (241539966999).

405540230121 is a wasteful number, since it uses less digits than its factorization.

405540230121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115102 (or 115096 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 405540230121 its reverse (121032045504), we get a palindrome (526572275625).

The spelling of 405540230121 in words is "four hundred five billion, five hundred forty million, two hundred thirty thousand, one hundred twenty-one".