21530226264 has 16 divisors (see below), whose sum is σ = 53825565720. Its totient is φ = 7176742080.

The previous prime is 21530226253. The next prime is 21530226271. The reversal of 21530226264 is 46262203512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448546357 + ... + 448546404.

Almost surely, 2^21530226264 is an apocalyptic number.

21530226264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21530226264 is an abundant number, since it is smaller than the sum of its proper divisors (32295339456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21530226264 is a wasteful number, since it uses less digits than its factorization.

21530226264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897092770 (or 897092766 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 21530226264 its reverse (46262203512), we get a palindrome (67792429776).

The spelling of 21530226264 in words is "twenty-one billion, five hundred thirty million, two hundred twenty-six thousand, two hundred sixty-four".