21014442240 has 144 divisors (see below), whose sum is σ = 73216374336. Its totient is φ = 5094400000.

The previous prime is 21014442227. The next prime is 21014442247. The reversal of 21014442240 is 4224441012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21014442240.

It is not an unprimeable number, because it can be changed into a prime (21014442247) 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, 206511 + ... + 290990.

It is an arithmetic number, because the mean of its divisors is an integer number (508447044).

Almost surely, 2^21014442240 is an apocalyptic number.

21014442240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21014442240 is an abundant number, since it is smaller than the sum of its proper divisors (52201932096).

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

21014442240 is a wasteful number, since it uses less digits than its factorization.

21014442240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497536 (or 497522 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21014442240 its reverse (4224441012), we get a palindrome (25238883252).

The spelling of 21014442240 in words is "twenty-one billion, fourteen million, four hundred forty-two thousand, two hundred forty".