21152211044440 has 32 divisors (see below), whose sum is σ = 54391399829280. Its totient is φ = 7252186643712.

The previous prime is 21152211044407. The next prime is 21152211044441. The reversal of 21152211044440 is 4444011225112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152211044441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37771805157 + ... + 37771805716.

It is an arithmetic number, because the mean of its divisors is an integer number (1699731244665).

Almost surely, 2^{21152211044440} is an apocalyptic number.

21152211044440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152211044440 is an abundant number, since it is smaller than the sum of its proper divisors (33239188784840).

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

21152211044440 is a wasteful number, since it uses less digits than its factorization.

21152211044440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75543610891 (or 75543610887 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

Adding to 21152211044440 its reverse (4444011225112), we get a palindrome (25596222269552).

The spelling of 21152211044440 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred eleven million, forty-four thousand, four hundred forty".