21066331562 has 16 divisors (see below), whose sum is σ = 32202739080. Its totient is φ = 10332172032.

The previous prime is 21066331477. The next prime is 21066331577. The reversal of 21066331562 is 26513366012.

It can be written as a sum of positive squares in 4 ways, for example, as 20511681961 + 554649601 = 143219^2 + 23551^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533078 + ... + 571230.

Almost surely, 2^21066331562 is an apocalyptic number.

21066331562 is a deficient number, since it is larger than the sum of its proper divisors (11136407518).

21066331562 is a wasteful number, since it uses less digits than its factorization.

21066331562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43417.

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 21066331562 its reverse (26513366012), we get a palindrome (47579697574).

The spelling of 21066331562 in words is "twenty-one billion, sixty-six million, three hundred thirty-one thousand, five hundred sixty-two".