21503766122 has 16 divisors (see below), whose sum is σ = 32770089000. Its totient is φ = 10581727680.

The previous prime is 21503766121. The next prime is 21503766127. The reversal of 21503766122 is 22166730512.

It can be written as a sum of positive squares in 4 ways, for example, as 18501712441 + 3002053681 = 136021^2 + 54791^2 .

It is not an unprimeable number, because it can be changed into a prime (21503766121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298529 + ... + 363492.

Almost surely, 2^21503766122 is an apocalyptic number.

21503766122 is a deficient number, since it is larger than the sum of its proper divisors (11266322878).

21503766122 is a wasteful number, since it uses less digits than its factorization.

21503766122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662281.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 21503766122 in words is "twenty-one billion, five hundred three million, seven hundred sixty-six thousand, one hundred twenty-two".