21366134424936 has 192 divisors, whose sum is σ = 66991597171200. Its totient is φ = 6025428864000.

The previous prime is 21366134424911. The next prime is 21366134425019. The reversal of 21366134424936 is 63942443166312.

21366134424936 is a `hidden beast` number, since 2 + 1 + 366 + 1 + 3 + 4 + 4 + 249 + 36 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 128164036 + ... + 128330636.

It is an arithmetic number, because the mean of its divisors is an integer number (348914568600).

Almost surely, 2^{21366134424936} 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 21366134424936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33495798585600).

21366134424936 is an abundant number, since it is smaller than the sum of its proper divisors (45625462746264).

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

21366134424936 is a wasteful number, since it uses less digits than its factorization.

21366134424936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169920 (or 169913 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 54.

The spelling of 21366134424936 in words is "twenty-one trillion, three hundred sixty-six billion, one hundred thirty-four million, four hundred twenty-four thousand, nine hundred thirty-six".