21500316514004 has 24 divisors (see below), whose sum is σ = 37911897535008. Its totient is φ = 10668514652640.

The previous prime is 21500316514003. The next prime is 21500316514007. The reversal of 21500316514004 is 40041561300512.

It is a super-2 number, since 2×21500316514004² (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 (21500316514003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20598074 + ... + 21616689.

It is an arithmetic number, because the mean of its divisors is an integer number (1579662397292).

Almost surely, 2^{21500316514004} is an apocalyptic number.

It is an amenable number.

21500316514004 is a deficient number, since it is larger than the sum of its proper divisors (16411581021004).

21500316514004 is a wasteful number, since it uses less digits than its factorization.

21500316514004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42215735 (or 42215733 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21500316514004 its reverse (40041561300512), we get a palindrome (61541877814516).

The spelling of 21500316514004 in words is "twenty-one trillion, five hundred billion, three hundred sixteen million, five hundred fourteen thousand, four".