21441421204 has 72 divisors (see below), whose sum is σ = 43821570240. Its totient is φ = 8992013184.

The previous prime is 21441421189. The next prime is 21441421259. The reversal of 21441421204 is 40212414412.

It is a happy number.

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 23 ways as a sum of consecutive naturals, for example, 22498392 + ... + 22499344.

It is an arithmetic number, because the mean of its divisors is an integer number (608632920).

Almost surely, 2^21441421204 is an apocalyptic number.

It is an amenable number.

21441421204 is an abundant number, since it is smaller than the sum of its proper divisors (22380149036).

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

21441421204 is a wasteful number, since it uses less digits than its factorization.

21441421204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1208 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21441421204 its reverse (40212414412), we get a palindrome (61653835616).

The spelling of 21441421204 in words is "twenty-one billion, four hundred forty-one million, four hundred twenty-one thousand, two hundred four".