21303234303240 has 32 divisors (see below), whose sum is σ = 63909702910080. Its totient is φ = 5680862480832.

The previous prime is 21303234303203. The next prime is 21303234303259. The reversal of 21303234303240 is 4230343230312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21303234303198 and 21303234303207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88763476144 + ... + 88763476383.

It is an arithmetic number, because the mean of its divisors is an integer number (1997178215940).

Almost surely, 2^{21303234303240} is an apocalyptic number.

21303234303240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303234303240 is an abundant number, since it is smaller than the sum of its proper divisors (42606468606840).

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

21303234303240 is a wasteful number, since it uses less digits than its factorization.

21303234303240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177526952541 (or 177526952537 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 30.

Adding to 21303234303240 its reverse (4230343230312), we get a palindrome (25533577533552).

The spelling of 21303234303240 in words is "twenty-one trillion, three hundred three billion, two hundred thirty-four million, three hundred three thousand, two hundred forty".