212420004 has 12 divisors (see below), whose sum is σ = 495646704. Its totient is φ = 70806664.

The previous prime is 212420003. The next prime is 212420027. The reversal of 212420004 is 400024212.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (212420003) 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, 8850822 + ... + 8850845.

It is an arithmetic number, because the mean of its divisors is an integer number (41303892).

Almost surely, 2^212420004 is an apocalyptic number.

It is an amenable number.

212420004 is an abundant number, since it is smaller than the sum of its proper divisors (283226700).

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

212420004 is a wasteful number, since it uses less digits than its factorization.

212420004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17701674 (or 17701672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 212420004 is about 14574.6356386704. The cubic root of 212420004 is about 596.6667050897. Note that the first 3 decimals are identical.

Adding to 212420004 its reverse (400024212), we get a palindrome (612444216).

The spelling of 212420004 in words is "two hundred twelve million, four hundred twenty thousand, four".