21120903378 has 12 divisors (see below), whose sum is σ = 45761957358. Its totient is φ = 7040301120.

The previous prime is 21120903361. The next prime is 21120903389. The reversal of 21120903378 is 87330902112.

21120903378 is a `hidden beast` number, since 211 + 20 + 90 + 337 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20313945729 + 806957649 = 142527^2 + 28407^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586691743 + ... + 586691778.

Almost surely, 2^21120903378 is an apocalyptic number.

21120903378 is an abundant number, since it is smaller than the sum of its proper divisors (24641053980).

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

21120903378 is a wasteful number, since it uses less digits than its factorization.

21120903378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173383529 (or 1173383526 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 21120903378 in words is "twenty-one billion, one hundred twenty million, nine hundred three thousand, three hundred seventy-eight".