21133780769412 has 36 divisors (see below), whose sum is σ = 53478514816636. Its totient is φ = 7037075335680.

The previous prime is 21133780769383. The next prime is 21133780769417. The reversal of 21133780769412 is 21496708733112.

21133780769412 is a `hidden beast` number, since 2 + 113 + 37 + 80 + 7 + 6 + 9 + 412 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12395229910596 + 8738550858816 = 3520686^2 + 2956104^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21133780769417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 313226389 + ... + 313293852.

Almost surely, 2^{21133780769412} is an apocalyptic number.

It is an amenable number.

21133780769412 is an abundant number, since it is smaller than the sum of its proper divisors (32344734047224).

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

21133780769412 is a wasteful number, since it uses less digits than its factorization.

21133780769412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626521188 (or 626521183 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 21133780769412 in words is "twenty-one trillion, one hundred thirty-three billion, seven hundred eighty million, seven hundred sixty-nine thousand, four hundred twelve".