21268265819136 has 176 divisors, whose sum is σ = 64821580376064. Its totient is φ = 6073302859776.

The previous prime is 21268265819123. The next prime is 21268265819137. The reversal of 21268265819136 is 63191856286212.

It is a self number, because there is not a number n which added to its sum of digits gives 21268265819136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21268265819137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38930526 + ... + 39473058.

Almost surely, 2^{21268265819136} 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 21268265819136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32410790188032).

21268265819136 is an abundant number, since it is smaller than the sum of its proper divisors (43553314556928).

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

21268265819136 is a wasteful number, since it uses less digits than its factorization.

21268265819136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544386 (or 544368 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 60.

The spelling of 21268265819136 in words is "twenty-one trillion, two hundred sixty-eight billion, two hundred sixty-five million, eight hundred nineteen thousand, one hundred thirty-six".