21615613314104 has 32 divisors (see below), whose sum is σ = 40812510096000. Its totient is φ = 10732317206400.

The previous prime is 21615613314091. The next prime is 21615613314109. The reversal of 21615613314104 is 40141331651612.

It is a super-2 number, since 2×21615613314104² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21615613314109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1842329 + ... + 6828279.

It is an arithmetic number, because the mean of its divisors is an integer number (1275390940500).

Almost surely, 2^{21615613314104} is an apocalyptic number.

It is an amenable number.

21615613314104 is a deficient number, since it is larger than the sum of its proper divisors (19196896781896).

21615613314104 is a wasteful number, since it uses less digits than its factorization.

21615613314104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989743 (or 4989739 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

Adding to 21615613314104 its reverse (40141331651612), we get a palindrome (61756944965716).

The spelling of 21615613314104 in words is "twenty-one trillion, six hundred fifteen billion, six hundred thirteen million, three hundred fourteen thousand, one hundred four".