21897664096036 has 81 divisors (see below), whose sum is σ = 39647264422003. Its totient is φ = 10582394911360.

The previous prime is 21897664096013. The next prime is 21897664096067. The reversal of 21897664096036 is 63069046679812.

The square root of 21897664096036 is 4679494.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 15507891256036 + 6389772840000 = 3938006^2 + 2527800^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 57174057501 + ... + 57174057883.

Almost surely, 2^{21897664096036} is an apocalyptic number.

21897664096036 is the 4679494-th square number.

It is an amenable number.

21897664096036 is a deficient number, since it is larger than the sum of its proper divisors (17749600325967).

21897664096036 is an frugal number, since it uses more digits than its factorization.

21897664096036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 67.

The spelling of 21897664096036 in words is "twenty-one trillion, eight hundred ninety-seven billion, six hundred sixty-four million, ninety-six thousand, thirty-six".