21000134212 has 24 divisors (see below), whose sum is σ = 36899644320. Its totient is φ = 10457462400.

The previous prime is 21000134189. The next prime is 21000134227. The reversal of 21000134212 is 21243100012.

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 7 ways as a sum of consecutive naturals, for example, 1047103 + ... + 1066969.

It is an arithmetic number, because the mean of its divisors is an integer number (1537485180).

Almost surely, 2^21000134212 is an apocalyptic number.

It is an amenable number.

21000134212 is a deficient number, since it is larger than the sum of its proper divisors (15899510108).

21000134212 is a wasteful number, since it uses less digits than its factorization.

21000134212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20931 (or 20929 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21000134212 its reverse (21243100012), we get a palindrome (42243234224).

The spelling of 21000134212 in words is "twenty-one billion, one hundred thirty-four thousand, two hundred twelve".