21020244148440 has 48 divisors (see below), whose sum is σ = 68315793483600. Its totient is φ = 5605398439488.

The previous prime is 21020244148417. The next prime is 21020244148441. The reversal of 21020244148440 is 4484144202012.

21020244148440 is a `hidden beast` number, since 2 + 1 + 0 + 202 + 4 + 4 + 1 + 4 + 8 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21020244148395 and 21020244148404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020244148441) 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 11 ways as a sum of consecutive naturals, for example, 29194783180 + ... + 29194783899.

It is an arithmetic number, because the mean of its divisors is an integer number (1423245697575).

Almost surely, 2^{21020244148440} is an apocalyptic number.

21020244148440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020244148440 is an abundant number, since it is smaller than the sum of its proper divisors (47295549335160).

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

21020244148440 is a wasteful number, since it uses less digits than its factorization.

21020244148440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58389567096 (or 58389567089 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 36.

The spelling of 21020244148440 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-eight thousand, four hundred forty".