21861480787365 has 16 divisors (see below), whose sum is σ = 35253789493248. Its totient is φ = 11567649675456.

The previous prime is 21861480787331. The next prime is 21861480787381. The reversal of 21861480787365 is 56378708416812.

It is not a de Polignac number, because 21861480787365 - 2²¹ = 21861478690213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21861480787296 and 21861480787305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5737919562 + ... + 5737923371.

It is an arithmetic number, because the mean of its divisors is an integer number (2203361843328).

Almost surely, 2^{21861480787365} is an apocalyptic number.

It is an amenable number.

21861480787365 is a deficient number, since it is larger than the sum of its proper divisors (13392308705883).

21861480787365 is a wasteful number, since it uses less digits than its factorization.

21861480787365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11475843068.

The product of its (nonzero) digits is 108380160, while the sum is 66.

The spelling of 21861480787365 in words is "twenty-one trillion, eight hundred sixty-one billion, four hundred eighty million, seven hundred eighty-seven thousand, three hundred sixty-five".