21445205410340 has 12 divisors (see below), whose sum is σ = 45034931361756. Its totient is φ = 8578082164128.

The previous prime is 21445205410303. The next prime is 21445205410361. The reversal of 21445205410340 is 4301450254412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8433587716096 + 13011617694244 = 2904064^2 + 3607162^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21445205410340.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536130135239 + ... + 536130135278.

It is an arithmetic number, because the mean of its divisors is an integer number (3752910946813).

Almost surely, 2^{21445205410340} is an apocalyptic number.

21445205410340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21445205410340 is an abundant number, since it is smaller than the sum of its proper divisors (23589725951416).

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

21445205410340 is a wasteful number, since it uses less digits than its factorization.

21445205410340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072260270526 (or 1072260270524 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 21445205410340 its reverse (4301450254412), we get a palindrome (25746655664752).

The spelling of 21445205410340 in words is "twenty-one trillion, four hundred forty-five billion, two hundred five million, four hundred ten thousand, three hundred forty".