21148596220 has 48 divisors (see below), whose sum is σ = 45543290688. Its totient is φ = 8244400640.

The previous prime is 21148596169. The next prime is 21148596319. The reversal of 21148596220 is 2269584112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 792942 + ... + 819178.

It is an arithmetic number, because the mean of its divisors is an integer number (948818556).

Almost surely, 2^21148596220 is an apocalyptic number.

21148596220 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 21148596220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22771645344).

21148596220 is an abundant number, since it is smaller than the sum of its proper divisors (24394694468).

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

21148596220 is a wasteful number, since it uses less digits than its factorization.

21148596220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27270 (or 27268 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 21148596220 in words is "twenty-one billion, one hundred forty-eight million, five hundred ninety-six thousand, two hundred twenty".