21532445025040 has 40 divisors (see below), whose sum is σ = 50065476140160. Its totient is φ = 8612540770176.

The previous prime is 21532445025023. The next prime is 21532445025041. The reversal of 21532445025040 is 4052054423512.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21532445025041) 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, 5243850 + ... + 8400169.

It is an arithmetic number, because the mean of its divisors is an integer number (1251636903504).

Almost surely, 2^{21532445025040} is an apocalyptic number.

21532445025040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21532445025040 is an abundant number, since it is smaller than the sum of its proper divisors (28533031115120).

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

21532445025040 is a wasteful number, since it uses less digits than its factorization.

21532445025040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13663759 (or 13663753 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 37.

Adding to 21532445025040 its reverse (4052054423512), we get a palindrome (25584499448552).

The spelling of 21532445025040 in words is "twenty-one trillion, five hundred thirty-two billion, four hundred forty-five million, twenty-five thousand, forty".