21630975226 has 48 divisors (see below), whose sum is σ = 38150065800. Its totient is φ = 9170921088.

The previous prime is 21630975221. The next prime is 21630975251. The reversal of 21630975226 is 62257903612.

It can be written as a sum of positive squares in 4 ways, for example, as 21491853201 + 139122025 = 146601^2 + 11795^2 .

It is not an unprimeable number, because it can be changed into a prime (21630975221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9366960 + ... + 9369268.

Almost surely, 2^21630975226 is an apocalyptic number.

21630975226 is a deficient number, since it is larger than the sum of its proper divisors (16519090574).

21630975226 is a wasteful number, since it uses less digits than its factorization.

21630975226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311 (or 3304 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 21630975226 in words is "twenty-one billion, six hundred thirty million, nine hundred seventy-five thousand, two hundred twenty-six".