213121421304404 has 12 divisors (see below), whose sum is σ = 372966833803200. Its totient is φ = 106559468789208.

The previous prime is 213121421304403. The next prime is 213121421304553. The reversal of 213121421304404 is 404403124121312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121421304401) 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, 310079564 + ... + 310766115.

It is an arithmetic number, because the mean of its divisors is an integer number (31080569483600).

Almost surely, 2^{213121421304404} is an apocalyptic number.

It is an amenable number.

213121421304404 is a deficient number, since it is larger than the sum of its proper divisors (159845412498796).

213121421304404 is a wasteful number, since it uses less digits than its factorization.

213121421304404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620931502 (or 620931500 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 213121421304404 its reverse (404403124121312), we get a palindrome (617524545425716).

The spelling of 213121421304404 in words is "two hundred thirteen trillion, one hundred twenty-one billion, four hundred twenty-one million, three hundred four thousand, four hundred four".