21044315412 has 144 divisors (see below), whose sum is σ = 57585848320. Its totient is φ = 6458356800.

The previous prime is 21044315339. The next prime is 21044315441. The reversal of 21044315412 is 21451344012.

21044315412 is a `hidden beast` number, since 210 + 4 + 4 + 31 + 5 + 412 = 666.

It is a super-2 number, since 2×21044315412² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6204237 + ... + 6207627.

Almost surely, 2^21044315412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21044315412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28792924160).

21044315412 is an abundant number, since it is smaller than the sum of its proper divisors (36541532908).

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

21044315412 is a wasteful number, since it uses less digits than its factorization.

21044315412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674 (or 3669 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21044315412 its reverse (21451344012), we get a palindrome (42495659424).

The spelling of 21044315412 in words is "twenty-one billion, forty-four million, three hundred fifteen thousand, four hundred twelve".