21226535700 has 72 divisors (see below), whose sum is σ = 61642304640. Its totient is φ = 5639500800.

The previous prime is 21226535647. The next prime is 21226535731. The reversal of 21226535700 is 753562212.

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 23 ways as a sum of consecutive naturals, for example, 49245 + ... + 211844.

It is an arithmetic number, because the mean of its divisors is an integer number (856143120).

Almost surely, 2^21226535700 is an apocalyptic number.

21226535700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21226535700 is an abundant number, since it is smaller than the sum of its proper divisors (40415768940).

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

21226535700 is a wasteful number, since it uses less digits than its factorization.

21226535700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261377 (or 261370 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The spelling of 21226535700 in words is "twenty-one billion, two hundred twenty-six million, five hundred thirty-five thousand, seven hundred".