21066530742 has 24 divisors (see below), whose sum is σ = 45907995744. Its totient is φ = 6981585264.

The previous prime is 21066530741. The next prime is 21066530767. The reversal of 21066530742 is 24703566012.

21066530742 is a `hidden beast` number, since 21 + 0 + 66 + 530 + 7 + 42 = 666.

It is a super-3 number, since 3×21066530742³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21066530697 and 21066530706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066530741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3379438 + ... + 3385665.

It is an arithmetic number, because the mean of its divisors is an integer number (1912833156).

Almost surely, 2^21066530742 is an apocalyptic number.

21066530742 is an abundant number, since it is smaller than the sum of its proper divisors (24841465002).

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

21066530742 is a wasteful number, since it uses less digits than its factorization.

21066530742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6765284 (or 6765281 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 21066530742 in words is "twenty-one billion, sixty-six million, five hundred thirty thousand, seven hundred forty-two".