21660197348 has 12 divisors (see below), whose sum is σ = 38159744700. Its totient is φ = 10757413152.

The previous prime is 21660197329. The next prime is 21660197359. The reversal of 21660197348 is 84379106612.

It can be written as a sum of positive squares in 2 ways, for example, as 4166960704 + 17493236644 = 64552^2 + 132262^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18170711 + ... + 18171902.

It is an arithmetic number, because the mean of its divisors is an integer number (3179978725).

Almost surely, 2^21660197348 is an apocalyptic number.

It is an amenable number.

21660197348 is a deficient number, since it is larger than the sum of its proper divisors (16499547352).

21660197348 is a wasteful number, since it uses less digits than its factorization.

21660197348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36342766 (or 36342764 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 21660197348 in words is "twenty-one billion, six hundred sixty million, one hundred ninety-seven thousand, three hundred forty-eight".