21200500005212 has 48 divisors (see below), whose sum is σ = 43510341127680. Its totient is φ = 8935159305600.

The previous prime is 21200500005133. The next prime is 21200500005257. The reversal of 21200500005212 is 21250000500212.

It is a happy number.

It is a super-2 number, since 2×21200500005212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269742089 + ... + 269820672.

It is an arithmetic number, because the mean of its divisors is an integer number (906465440160).

Almost surely, 2^{21200500005212} is an apocalyptic number.

21200500005212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21200500005212 is an abundant number, since it is smaller than the sum of its proper divisors (22309841122468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200500005212 is a wasteful number, since it uses less digits than its factorization.

21200500005212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539562842 (or 539562840 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 21200500005212 its reverse (21250000500212), we get a palindrome (42450500505424).

The spelling of 21200500005212 in words is "twenty-one trillion, two hundred billion, five hundred million, five thousand, two hundred twelve".