21136783248 has 480 divisors, whose sum is σ = 73882215680. Its totient is φ = 5665904640.

The previous prime is 21136783229. The next prime is 21136783277. The reversal of 21136783248 is 84238763112.

21136783248 is a `hidden beast` number, since 211 + 367 + 8 + 32 + 48 = 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 95 ways as a sum of consecutive naturals, for example, 116777718 + ... + 116777898.

Almost surely, 2^21136783248 is an apocalyptic number.

21136783248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21136783248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36941107840).

21136783248 is an abundant number, since it is smaller than the sum of its proper divisors (52745432432).

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

21136783248 is a wasteful number, since it uses less digits than its factorization.

21136783248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 289 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The spelling of 21136783248 in words is "twenty-one billion, one hundred thirty-six million, seven hundred eighty-three thousand, two hundred forty-eight".