21522165230 has 16 divisors (see below), whose sum is σ = 38741568624. Its totient is φ = 8608494720.

The previous prime is 21522165229. The next prime is 21522165251. The reversal of 21522165230 is 3256122512.

It is a junction number, because it is equal to n+sod(n) for n = 21522165193 and 21522165202.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 423485 + ... + 471575.

It is an arithmetic number, because the mean of its divisors is an integer number (2421348039).

Almost surely, 2^21522165230 is an apocalyptic number.

21522165230 is a deficient number, since it is larger than the sum of its proper divisors (17219403394).

21522165230 is a wasteful number, since it uses less digits than its factorization.

21522165230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92851.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21522165230 its reverse (3256122512), we get a palindrome (24778287742).

The spelling of 21522165230 in words is "twenty-one billion, five hundred twenty-two million, one hundred sixty-five thousand, two hundred thirty".