21134005212 has 12 divisors (see below), whose sum is σ = 49312678856. Its totient is φ = 7044668400.

The previous prime is 21134005201. The next prime is 21134005213. The reversal of 21134005212 is 21250043112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134005213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880583539 + ... + 880583562.

Almost surely, 2^21134005212 is an apocalyptic number.

It is an amenable number.

21134005212 is an abundant number, since it is smaller than the sum of its proper divisors (28178673644).

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

21134005212 is a wasteful number, since it uses less digits than its factorization.

21134005212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761167108 (or 1761167106 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21134005212 its reverse (21250043112), we get a palindrome (42384048324).

The spelling of 21134005212 in words is "twenty-one billion, one hundred thirty-four million, five thousand, two hundred twelve".