21089671356 has 48 divisors (see below), whose sum is σ = 53035926944. Its totient is φ = 6484064256.

The previous prime is 21089671321. The next prime is 21089671387. The reversal of 21089671356 is 65317698012.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 150216 + ... + 254448.

Almost surely, 2^21089671356 is an apocalyptic number.

21089671356 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21089671356 is an abundant number, since it is smaller than the sum of its proper divisors (31946255588).

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

21089671356 is a wasteful number, since it uses less digits than its factorization.

21089671356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105550 (or 105548 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 21089671356 in words is "twenty-one billion, eighty-nine million, six hundred seventy-one thousand, three hundred fifty-six".