21422452145440 has 96 divisors (see below), whose sum is σ = 52033882393584. Its totient is φ = 8328486666240.

The previous prime is 21422452145377. The next prime is 21422452145443. The reversal of 21422452145440 is 4454125422412.

It can be written as a sum of positive squares in 8 ways, for example, as 11940314386576 + 9482137758864 = 3455476^2 + 3079308^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 21422452145393 and 21422452145402.

It is not an unprimeable number, because it can be changed into a prime (21422452145443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3616060 + ... + 7478020.

Almost surely, 2^{21422452145440} is an apocalyptic number.

21422452145440 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 21422452145440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26016941196792).

21422452145440 is an abundant number, since it is smaller than the sum of its proper divisors (30611430248144).

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

21422452145440 is a wasteful number, since it uses less digits than its factorization.

21422452145440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862950 (or 3862942 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 40.

Adding to 21422452145440 its reverse (4454125422412), we get a palindrome (25876577567852).

The spelling of 21422452145440 in words is "twenty-one trillion, four hundred twenty-two billion, four hundred fifty-two million, one hundred forty-five thousand, four hundred forty".