21660424204334 has 16 divisors (see below), whose sum is σ = 33283241893440. Its totient is φ = 10566012637440.

The previous prime is 21660424204327. The next prime is 21660424204357. The reversal of 21660424204334 is 43340242406612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 21660424204291 and 21660424204300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23407547 + ... + 24315305.

It is an arithmetic number, because the mean of its divisors is an integer number (2080202618340).

Almost surely, 2^{21660424204334} is an apocalyptic number.

21660424204334 is a deficient number, since it is larger than the sum of its proper divisors (11622817689106).

21660424204334 is a wasteful number, since it uses less digits than its factorization.

21660424204334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198795.

The product of its (nonzero) digits is 663552, while the sum is 41.

The spelling of 21660424204334 in words is "twenty-one trillion, six hundred sixty billion, four hundred twenty-four million, two hundred four thousand, three hundred thirty-four".