212140404 has 72 divisors (see below), whose sum is σ = 639804480. Its totient is φ = 60610032.

The previous prime is 212140391. The next prime is 212140421. The reversal of 212140404 is 404041212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14752 + ... + 25335.

Almost surely, 2^212140404 is an apocalyptic number.

It is an amenable number.

212140404 is an abundant number, since it is smaller than the sum of its proper divisors (427664076).

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

212140404 is a wasteful number, since it uses less digits than its factorization.

212140404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40114 (or 40099 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 212140404 is about 14565.0404736822. The cubic root of 212140404 is about 596.4048005962.

Adding to 212140404 its reverse (404041212), we get a palindrome (616181616).

The spelling of 212140404 in words is "two hundred twelve million, one hundred forty thousand, four hundred four".