21523430116 has 6 divisors (see below), whose sum is σ = 37666002710. Its totient is φ = 10761715056.

The previous prime is 21523430081. The next prime is 21523430161. The reversal of 21523430116 is 61103432512.

It can be written as a sum of positive squares in only one way, i.e., 19962864100 + 1560566016 = 141290^2 + 39504^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2690428761 + ... + 2690428768.

Almost surely, 2^21523430116 is an apocalyptic number.

It is an amenable number.

21523430116 is a deficient number, since it is larger than the sum of its proper divisors (16142572594).

21523430116 is a wasteful number, since it uses less digits than its factorization.

21523430116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5380857533 (or 5380857531 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21523430116 its reverse (61103432512), we get a palindrome (82626862628).

It can be divided in two parts, 215234 and 30116, that added together give a triangular number (245350 = T₇₀₀).

The spelling of 21523430116 in words is "twenty-one billion, five hundred twenty-three million, four hundred thirty thousand, one hundred sixteen".