21214036536688 has 80 divisors (see below), whose sum is σ = 43334312140800. Its totient is φ = 10045640448000.

The previous prime is 21214036536677. The next prime is 21214036536689. The reversal of 21214036536688 is 88663563041212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536689) 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, 364780413 + ... + 364838563.

It is an arithmetic number, because the mean of its divisors is an integer number (541678901760).

Almost surely, 2^{21214036536688} 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 21214036536688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21667156070400).

21214036536688 is an abundant number, since it is smaller than the sum of its proper divisors (22120275604112).

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

21214036536688 is a wasteful number, since it uses less digits than its factorization.

21214036536688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73886 (or 73880 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 55.

The spelling of 21214036536688 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, six hundred eighty-eight".