21661030322404 has 48 divisors (see below), whose sum is σ = 41751994467456. Its totient is φ = 9832377894240.

The previous prime is 21661030322387. The next prime is 21661030322411. The reversal of 21661030322404 is 40422303016612.

It is a self number, because there is not a number n which added to its sum of digits gives 21661030322404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1072362 + ... + 6668734.

It is an arithmetic number, because the mean of its divisors is an integer number (869833218072).

Almost surely, 2^{21661030322404} is an apocalyptic number.

It is an amenable number.

21661030322404 is a deficient number, since it is larger than the sum of its proper divisors (20090964145052).

21661030322404 is a wasteful number, since it uses less digits than its factorization.

21661030322404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5597137 (or 5597113 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 21661030322404 in words is "twenty-one trillion, six hundred sixty-one billion, thirty million, three hundred twenty-two thousand, four hundred four".