21404230240 has 48 divisors (see below), whose sum is σ = 52198715520. Its totient is φ = 8285506560.

The previous prime is 21404230231. The next prime is 21404230249. The reversal of 21404230240 is 4203240412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21404230231) and next prime (21404230249).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404230249) by changing a digit.

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, 2152725 + ... + 2162644.

It is an arithmetic number, because the mean of its divisors is an integer number (1087473240).

Almost surely, 2^21404230240 is an apocalyptic number.

21404230240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404230240 is an abundant number, since it is smaller than the sum of its proper divisors (30794485280).

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

21404230240 is a wasteful number, since it uses less digits than its factorization.

21404230240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315415 (or 4315407 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21404230240 its reverse (4203240412), we get a palindrome (25607470652).

The spelling of 21404230240 in words is "twenty-one billion, four hundred four million, two hundred thirty thousand, two hundred forty".