21434054412 has 12 divisors (see below), whose sum is σ = 50012793656. Its totient is φ = 7144684800.

The previous prime is 21434054387. The next prime is 21434054419. The reversal of 21434054412 is 21445043412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21434054412.

It is not an unprimeable number, because it can be changed into a prime (21434054419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893085589 + ... + 893085612.

Almost surely, 2^21434054412 is an apocalyptic number.

It is an amenable number.

21434054412 is an abundant number, since it is smaller than the sum of its proper divisors (28578739244).

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

21434054412 is a wasteful number, since it uses less digits than its factorization.

21434054412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786171208 (or 1786171206 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21434054412 its reverse (21445043412), we get a palindrome (42879097824).

The spelling of 21434054412 in words is "twenty-one billion, four hundred thirty-four million, fifty-four thousand, four hundred twelve".