21500034212 has 12 divisors (see below), whose sum is σ = 39605326320. Its totient is φ = 10184226696.

The previous prime is 21500034209. The next prime is 21500034223. The reversal of 21500034212 is 21243000512.

It is a super-2 number, since 2×21500034212² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141447518 + ... + 141447669.

It is an arithmetic number, because the mean of its divisors is an integer number (3300443860).

Almost surely, 2^21500034212 is an apocalyptic number.

It is an amenable number.

21500034212 is a deficient number, since it is larger than the sum of its proper divisors (18105292108).

21500034212 is a wasteful number, since it uses less digits than its factorization.

21500034212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282895210 (or 282895208 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21500034212 its reverse (21243000512), we get a palindrome (42743034724).

The spelling of 21500034212 in words is "twenty-one billion, five hundred million, thirty-four thousand, two hundred twelve".