212540404 has 6 divisors (see below), whose sum is σ = 371945714. Its totient is φ = 106270200.

The previous prime is 212540389. The next prime is 212540411. The reversal of 212540404 is 404045212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 126607504 + 85932900 = 11252^2 + 9270^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26567547 + ... + 26567554.

Almost surely, 2^212540404 is an apocalyptic number.

It is an amenable number.

212540404 is a deficient number, since it is larger than the sum of its proper divisors (159405310).

212540404 is a wasteful number, since it uses less digits than its factorization.

212540404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53135105 (or 53135103 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 212540404 is about 14578.7655170114. The cubic root of 212540404 is about 596.7794143472.

Adding to 212540404 its reverse (404045212), we get a palindrome (616585616).

The spelling of 212540404 in words is "two hundred twelve million, five hundred forty thousand, four hundred four".