21403302240 has 96 divisors (see below), whose sum is σ = 67452134400. Its totient is φ = 5704861184.

The previous prime is 21403302197. The next prime is 21403302241. The reversal of 21403302240 is 4220330412.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403302241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1142227 + ... + 1160813.

It is an arithmetic number, because the mean of its divisors is an integer number (702626400).

Almost surely, 2^21403302240 is an apocalyptic number.

21403302240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21403302240 is an abundant number, since it is smaller than the sum of its proper divisors (46048832160).

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

21403302240 is a wasteful number, since it uses less digits than its factorization.

21403302240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21004 (or 20996 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21403302240 its reverse (4220330412), we get a palindrome (25623632652).

The spelling of 21403302240 in words is "twenty-one billion, four hundred three million, three hundred two thousand, two hundred forty".