21276108357 has 24 divisors (see below), whose sum is σ = 33240583296. Its totient is φ = 12069021888.

The previous prime is 21276108349. The next prime is 21276108367. The reversal of 21276108357 is 75380167212.

It is not a de Polignac number, because 21276108357 - 2³ = 21276108349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276108367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 508093 + ... + 548370.

It is an arithmetic number, because the mean of its divisors is an integer number (1385024304).

Almost surely, 2^21276108357 is an apocalyptic number.

It is an amenable number.

21276108357 is a deficient number, since it is larger than the sum of its proper divisors (11964474939).

21276108357 is a wasteful number, since it uses less digits than its factorization.

21276108357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056617 (or 1056610 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 21276108357 in words is "twenty-one billion, two hundred seventy-six million, one hundred eight thousand, three hundred fifty-seven".