21241213404 has 24 divisors (see below), whose sum is σ = 49567584528. Its totient is φ = 7079725440.

The previous prime is 21241213373. The next prime is 21241213439. The reversal of 21241213404 is 40431214212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54634 + ... + 213230.

It is an arithmetic number, because the mean of its divisors is an integer number (2065316022).

Almost surely, 2^21241213404 is an apocalyptic number.

It is an amenable number.

21241213404 is an abundant number, since it is smaller than the sum of its proper divisors (28326371124).

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

21241213404 is a wasteful number, since it uses less digits than its factorization.

21241213404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169765 (or 169763 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21241213404 its reverse (40431214212), we get a palindrome (61672427616).

The spelling of 21241213404 in words is "twenty-one billion, two hundred forty-one million, two hundred thirteen thousand, four hundred four".