21303157828 has 12 divisors (see below), whose sum is σ = 37293686892. Its totient is φ = 10647818720.

The previous prime is 21303157783. The next prime is 21303157859. The reversal of 21303157828 is 82875130312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12331658304 + 8971499524 = 111048^2 + 94718^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927283 + ... + 949978.

It is an arithmetic number, because the mean of its divisors is an integer number (3107807241).

Almost surely, 2^21303157828 is an apocalyptic number.

It is an amenable number.

21303157828 is a deficient number, since it is larger than the sum of its proper divisors (15990529064).

21303157828 is a wasteful number, since it uses less digits than its factorization.

21303157828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880102 (or 1880100 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 21303157828 in words is "twenty-one billion, three hundred three million, one hundred fifty-seven thousand, eight hundred twenty-eight".