21452636120 has 64 divisors (see below), whose sum is σ = 49892163840. Its totient is φ = 8293132800.

The previous prime is 21452636119. The next prime is 21452636123. The reversal of 21452636120 is 2163625412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452636123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947330 + ... + 969710.

It is an arithmetic number, because the mean of its divisors is an integer number (779565060).

Almost surely, 2^21452636120 is an apocalyptic number.

21452636120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21452636120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24946081920).

21452636120 is an abundant number, since it is smaller than the sum of its proper divisors (28439527720).

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

21452636120 is a wasteful number, since it uses less digits than its factorization.

21452636120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23196 (or 23192 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21452636120 in words is "twenty-one billion, four hundred fifty-two million, six hundred thirty-six thousand, one hundred twenty".