405020135212 has 192 divisors, whose sum is σ = 967192289280. Its totient is φ = 143526297600.

The previous prime is 405020135207. The next prime is 405020135279. The reversal of 405020135212 is 212531020504.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 163775608 + ... + 163778080.

It is an arithmetic number, because the mean of its divisors is an integer number (5037459840).

Almost surely, 2^405020135212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405020135212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (483596144640).

405020135212 is an abundant number, since it is smaller than the sum of its proper divisors (562172154068).

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

405020135212 is a wasteful number, since it uses less digits than its factorization.

405020135212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552 (or 3550 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 405020135212 its reverse (212531020504), we get a palindrome (617551155716).

The spelling of 405020135212 in words is "four hundred five billion, twenty million, one hundred thirty-five thousand, two hundred twelve".