212855323506 has 48 divisors (see below), whose sum is σ = 495317138976. Its totient is φ = 60803193024.

The previous prime is 212855323501. The next prime is 212855323519. The reversal of 212855323506 is 605323558212.

It is a super-2 number, since 2×212855323506² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (212855323501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1393590 + ... + 1538766.

It is an arithmetic number, because the mean of its divisors is an integer number (10319107062).

Almost surely, 2^212855323506 is an apocalyptic number.

212855323506 is an abundant number, since it is smaller than the sum of its proper divisors (282461815470).

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

212855323506 is a wasteful number, since it uses less digits than its factorization.

212855323506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150183 (or 150176 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 212855323506 in words is "two hundred twelve billion, eight hundred fifty-five million, three hundred twenty-three thousand, five hundred six".