21300312240 has 60 divisors (see below), whose sum is σ = 71533551024. Its totient is φ = 5680083072.

The previous prime is 21300312233. The next prime is 21300312247. The reversal of 21300312240 is 4221300312.

It is an interprime number because it is at equal distance from previous prime (21300312233) and next prime (21300312247).

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21300312247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14791164 + ... + 14792603.

Almost surely, 2^21300312240 is an apocalyptic number.

21300312240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300312240 is an abundant number, since it is smaller than the sum of its proper divisors (50233238784).

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

21300312240 is a wasteful number, since it uses less digits than its factorization.

21300312240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29583786 (or 29583777 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21300312240 its reverse (4221300312), we get a palindrome (25521612552).

The spelling of 21300312240 in words is "twenty-one billion, three hundred million, three hundred twelve thousand, two hundred forty".