21412681018564 has 12 divisors (see below), whose sum is σ = 40878754671888. Its totient is φ = 9733036826600.

The previous prime is 21412681018549. The next prime is 21412681018567. The reversal of 21412681018564 is 46581018621412.

It is not an unprimeable number, because it can be changed into a prime (21412681018567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243325920622 + ... + 243325920709.

It is an arithmetic number, because the mean of its divisors is an integer number (3406562889324).

Almost surely, 2^{21412681018564} is an apocalyptic number.

It is an amenable number.

21412681018564 is a deficient number, since it is larger than the sum of its proper divisors (19466073653324).

21412681018564 is a wasteful number, since it uses less digits than its factorization.

21412681018564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486651841346 (or 486651841344 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 49.

Adding to 21412681018564 its reverse (46581018621412), we get a palindrome (67993699639976).

The spelling of 21412681018564 in words is "twenty-one trillion, four hundred twelve billion, six hundred eighty-one million, eighteen thousand, five hundred sixty-four".