212005281985 has 64 divisors (see below), whose sum is σ = 311991482880. Its totient is φ = 135217797120.

The previous prime is 212005281973. The next prime is 212005281991. The reversal of 212005281985 is 589182500212.

It is not a de Polignac number, because 212005281985 - 2⁷ = 212005281857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

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, 3152815 + ... + 3219355.

It is an arithmetic number, because the mean of its divisors is an integer number (4874866920).

Almost surely, 2^212005281985 is an apocalyptic number.

It is an amenable number.

212005281985 is a deficient number, since it is larger than the sum of its proper divisors (99986200895).

212005281985 is a wasteful number, since it uses less digits than its factorization.

212005281985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66698.

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 212005281985 in words is "two hundred twelve billion, five million, two hundred eighty-one thousand, nine hundred eighty-five".