21189708633 has 16 divisors (see below), whose sum is σ = 30130107840. Its totient is φ = 13199847936.

The previous prime is 21189708623. The next prime is 21189708641. The reversal of 21189708633 is 33680798112.

It is not a de Polignac number, because 21189708633 - 2¹⁷ = 21189577561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21189708623) 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 15 ways as a sum of consecutive naturals, for example, 1487460 + ... + 1501637.

It is an arithmetic number, because the mean of its divisors is an integer number (1883131740).

Almost surely, 2^21189708633 is an apocalyptic number.

It is an amenable number.

21189708633 is a deficient number, since it is larger than the sum of its proper divisors (8940399207).

21189708633 is a wasteful number, since it uses less digits than its factorization.

21189708633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989256.

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 21189708633 in words is "twenty-one billion, one hundred eighty-nine million, seven hundred eight thousand, six hundred thirty-three".