21133187712 has 480 divisors, whose sum is σ = 77876045280. Its totient is φ = 5570353152.

The previous prime is 21133187711. The next prime is 21133187749. The reversal of 21133187712 is 21778133112.

It is a happy number.

It is a super-2 number, since 2×21133187712² (a number of 21 digits) contains 22 as substring.

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

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

It is not an unprimeable number, because it can be changed into a prime (21133187711) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 12264483 + ... + 12266205.

It is an arithmetic number, because the mean of its divisors is an integer number (162241761).

Almost surely, 2^21133187712 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 21133187712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38938022640).

21133187712 is an abundant number, since it is smaller than the sum of its proper divisors (56742857568).

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

21133187712 is a wasteful number, since it uses less digits than its factorization.

21133187712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782 (or 1748 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The spelling of 21133187712 in words is "twenty-one billion, one hundred thirty-three million, one hundred eighty-seven thousand, seven hundred twelve".