21189092845 has 8 divisors (see below), whose sum is σ = 26114125464. Its totient is φ = 16493131584.

The previous prime is 21189092831. The next prime is 21189092849. The reversal of 21189092845 is 54829098112.

It can be written as a sum of positive squares in 4 ways, for example, as 1695627684 + 19493465161 = 41178^2 + 139619^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21189092845 - 2²⁷ = 21054875117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21189092849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57267634 + ... + 57268003.

It is an arithmetic number, because the mean of its divisors is an integer number (3264265683).

Almost surely, 2^21189092845 is an apocalyptic number.

It is an amenable number.

21189092845 is a deficient number, since it is larger than the sum of its proper divisors (4925032619).

21189092845 is a wasteful number, since it uses less digits than its factorization.

21189092845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114535679.

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 21189092845 in words is "twenty-one billion, one hundred eighty-nine million, ninety-two thousand, eight hundred forty-five".