21240200135212 has 24 divisors (see below), whose sum is σ = 37491433943040. Its totient is φ = 10528488668880.

The previous prime is 21240200135159. The next prime is 21240200135233. The reversal of 21240200135212 is 21253100204212.

It is a super-2 number, since 2×21240200135212² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15179614 + ... + 16519717.

It is an arithmetic number, because the mean of its divisors is an integer number (1562143080960).

Almost surely, 2^{21240200135212} is an apocalyptic number.

It is an amenable number.

21240200135212 is a deficient number, since it is larger than the sum of its proper divisors (16251233807828).

21240200135212 is a wasteful number, since it uses less digits than its factorization.

21240200135212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31700781 (or 31700779 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21240200135212 its reverse (21253100204212), we get a palindrome (42493300339424).

The spelling of 21240200135212 in words is "twenty-one trillion, two hundred forty billion, two hundred million, one hundred thirty-five thousand, two hundred twelve".