212131785 has 8 divisors (see below), whose sum is σ = 339410880. Its totient is φ = 113136944.

The previous prime is 212131697. The next prime is 212131793. The reversal of 212131785 is 587131212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212131785 - 2¹⁶ = 212066249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7071045 + ... + 7071074.

It is an arithmetic number, because the mean of its divisors is an integer number (42426360).

Almost surely, 2^212131785 is an apocalyptic number.

It is an amenable number.

212131785 is a deficient number, since it is larger than the sum of its proper divisors (127279095).

212131785 is a wasteful number, since it uses less digits than its factorization.

212131785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14142127.

The product of its digits is 3360, while the sum is 30.

The square root of 212131785 is about 14564.7445909635. The cubic root of 212131785 is about 596.3967234257.

Adding to 212131785 its reverse (587131212), we get a palindrome (799262997).

The spelling of 212131785 in words is "two hundred twelve million, one hundred thirty-one thousand, seven hundred eighty-five".