21611726730406 has 4 divisors (see below), whose sum is σ = 32417590095612. Its totient is φ = 10805863365202.

The previous prime is 21611726730383. The next prime is 21611726730427. The reversal of 21611726730406 is 60403762711612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5402931682600 + ... + 5402931682603.

It is an arithmetic number, because the mean of its divisors is an integer number (8104397523903).

Almost surely, 2^{21611726730406} is an apocalyptic number.

21611726730406 is a deficient number, since it is larger than the sum of its proper divisors (10805863365206).

21611726730406 is a wasteful number, since it uses less digits than its factorization.

21611726730406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10805863365205.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 21611726730406 in words is "twenty-one trillion, six hundred eleven billion, seven hundred twenty-six million, seven hundred thirty thousand, four hundred six".