21303153729 has 24 divisors (see below), whose sum is σ = 36150808512. Its totient is φ = 11917847520.

The previous prime is 21303153721. The next prime is 21303153733. The reversal of 21303153729 is 92735130312.

It is a happy number.

It is not a de Polignac number, because 21303153729 - 2³ = 21303153721 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21303153693 and 21303153702.

It is not an unprimeable number, because it can be changed into a prime (21303153721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8274997 + ... + 8277570.

It is an arithmetic number, because the mean of its divisors is an integer number (1506283688).

Almost surely, 2^21303153729 is an apocalyptic number.

It is an amenable number.

21303153729 is a deficient number, since it is larger than the sum of its proper divisors (14847654783).

21303153729 is a wasteful number, since it uses less digits than its factorization.

21303153729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16552597 (or 16552594 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The spelling of 21303153729 in words is "twenty-one billion, three hundred three million, one hundred fifty-three thousand, seven hundred twenty-nine".