21611770626044 has 72 divisors (see below), whose sum is σ = 39075108549120. Its totient is φ = 10458518212800.

The previous prime is 21611770626023. The next prime is 21611770626077. The reversal of 21611770626044 is 44062607711612.

It is a self number, because there is not a number n which added to its sum of digits gives 21611770626044.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2993731067 + ... + 2993738285.

It is an arithmetic number, because the mean of its divisors is an integer number (542709840960).

Almost surely, 2^{21611770626044} is an apocalyptic number.

It is an amenable number.

21611770626044 is a deficient number, since it is larger than the sum of its proper divisors (17463337923076).

21611770626044 is a wasteful number, since it uses less digits than its factorization.

21611770626044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10099 (or 10060 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 21611770626044 in words is "twenty-one trillion, six hundred eleven billion, seven hundred seventy million, six hundred twenty-six thousand, forty-four".