21134444412 has 24 divisors (see below), whose sum is σ = 49317786112. Its totient is φ = 7044231600.

The previous prime is 21134444407. The next prime is 21134444417. The reversal of 21134444412 is 21444443112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21134444407) and next prime (21134444417).

It is a super-3 number, since 3×21134444412³ (a number of 32 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21134444412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134444417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93237 + ... + 225747.

Almost surely, 2^21134444412 is an apocalyptic number.

It is an amenable number.

21134444412 is an abundant number, since it is smaller than the sum of its proper divisors (28183341700).

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

21134444412 is a wasteful number, since it uses less digits than its factorization.

21134444412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145809 (or 145807 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

Adding to 21134444412 its reverse (21444443112), we get a palindrome (42578887524).

The spelling of 21134444412 in words is "twenty-one billion, one hundred thirty-four million, four hundred forty-four thousand, four hundred twelve".