21300312444 has 24 divisors (see below), whose sum is σ = 52316557440. Its totient is φ = 6726414384.

The previous prime is 21300312419. The next prime is 21300312479. The reversal of 21300312444 is 44421300312.

It is a congruent number.

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, 46710984 + ... + 46711439.

It is an arithmetic number, because the mean of its divisors is an integer number (2179856560).

Almost surely, 2^21300312444 is an apocalyptic number.

It is an amenable number.

21300312444 is an abundant number, since it is smaller than the sum of its proper divisors (31016244996).

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

21300312444 is a wasteful number, since it uses less digits than its factorization.

21300312444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93422449 (or 93422447 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21300312444 its reverse (44421300312), we get a palindrome (65721612756).

The spelling of 21300312444 in words is "twenty-one billion, three hundred million, three hundred twelve thousand, four hundred forty-four".