212311404 has 18 divisors (see below), whose sum is σ = 536676140. Its totient is φ = 70770456.

The previous prime is 212311403. The next prime is 212311417. The reversal of 212311404 is 404113212.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×212311404² = 90152264536902432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (212311403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2948734 + ... + 2948805.

Almost surely, 2^212311404 is an apocalyptic number.

It is an amenable number.

212311404 is an abundant number, since it is smaller than the sum of its proper divisors (324364736).

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

212311404 is a wasteful number, since it uses less digits than its factorization.

212311404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5897549 (or 5897544 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 212311404 is about 14570.9095117635. The cubic root of 212311404 is about 596.5650055498.

Adding to 212311404 its reverse (404113212), we get a palindrome (616424616).

The spelling of 212311404 in words is "two hundred twelve million, three hundred eleven thousand, four hundred four".