212412691 has 4 divisors (see below), whose sum is σ = 212619352. Its totient is φ = 212206032.

The previous prime is 212412667. The next prime is 212412719. The reversal of 212412691 is 196214212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212412691 is a prime.

It is a super-2 number, since 2×212412691² = 90238302595722962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212412601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101781 + ... + 103846.

It is an arithmetic number, because the mean of its divisors is an integer number (53154838).

Almost surely, 2^212412691 is an apocalyptic number.

212412691 is a deficient number, since it is larger than the sum of its proper divisors (206661).

212412691 is a wasteful number, since it uses less digits than its factorization.

212412691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206660.

The product of its digits is 1728, while the sum is 28.

The square root of 212412691 is about 14574.3847554537. The cubic root of 212412691 is about 596.6598578474.

It can be divided in two parts, 21241 and 2691, that added together give a palindrome (23932).

The spelling of 212412691 in words is "two hundred twelve million, four hundred twelve thousand, six hundred ninety-one".