21296145312 has 144 divisors (see below), whose sum is σ = 66006184608. Its totient is φ = 6473617920.

The previous prime is 21296145287. The next prime is 21296145317. The reversal of 21296145312 is 21354169212.

21296145312 is a `hidden beast` number, since 2 + 1 + 2 + 9 + 614 + 5 + 31 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21296145317) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 276487 + ... + 345017.

It is an arithmetic number, because the mean of its divisors is an integer number (458376282).

Almost surely, 2^21296145312 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 21296145312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33003092304).

21296145312 is an abundant number, since it is smaller than the sum of its proper divisors (44710039296).

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

21296145312 is a wasteful number, since it uses less digits than its factorization.

21296145312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68643 (or 68632 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The spelling of 21296145312 in words is "twenty-one billion, two hundred ninety-six million, one hundred forty-five thousand, three hundred twelve".