21500520213310 has 16 divisors (see below), whose sum is σ = 38824581553776. Its totient is φ = 8572731380928.

The previous prime is 21500520213251. The next prime is 21500520213391. The reversal of 21500520213310 is 1331202500512.

It is a super-4 number, since 4×21500520213310⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3434584764 + ... + 3434591023.

It is an arithmetic number, because the mean of its divisors is an integer number (2426536347111).

Almost surely, 2^{21500520213310} is an apocalyptic number.

21500520213310 is a deficient number, since it is larger than the sum of its proper divisors (17324061340466).

21500520213310 is a wasteful number, since it uses less digits than its factorization.

21500520213310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6869176107.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21500520213310 its reverse (1331202500512), we get a palindrome (22831722713822).

The spelling of 21500520213310 in words is "twenty-one trillion, five hundred billion, five hundred twenty million, two hundred thirteen thousand, three hundred ten".