21150012154365 has 48 divisors (see below), whose sum is σ = 38020806253248. Its totient is φ = 11279114407296.

The previous prime is 21150012154361. The next prime is 21150012154393. The reversal of 21150012154365 is 56345121005112.

21150012154365 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 0 + 0 + 1 + 215 + 436 + 5 = 666.

It is not a de Polignac number, because 21150012154365 - 2² = 21150012154361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150012154361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14825097 + ... + 16188993.

It is an arithmetic number, because the mean of its divisors is an integer number (792100130276).

Almost surely, 2^{21150012154365} is an apocalyptic number.

It is an amenable number.

21150012154365 is a deficient number, since it is larger than the sum of its proper divisors (16870794098883).

21150012154365 is a wasteful number, since it uses less digits than its factorization.

21150012154365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376680 (or 1376668 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 21150012154365 its reverse (56345121005112), we get a palindrome (77495133159477).

The spelling of 21150012154365 in words is "twenty-one trillion, one hundred fifty billion, twelve million, one hundred fifty-four thousand, three hundred sixty-five".