21440314540520 has 16 divisors (see below), whose sum is σ = 48240707716260. Its totient is φ = 8576125816192.

The previous prime is 21440314540501. The next prime is 21440314540523. The reversal of 21440314540520 is 2504541304412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20722834390756 + 717480149764 = 4552234^2 + 847042^2 .

It is not an unprimeable number, because it can be changed into a prime (21440314540523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268003931717 + ... + 268003931796.

Almost surely, 2^{21440314540520} is an apocalyptic number.

21440314540520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440314540520 is an abundant number, since it is smaller than the sum of its proper divisors (26800393175740).

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

21440314540520 is a wasteful number, since it uses less digits than its factorization.

21440314540520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536007863524 (or 536007863520 counting only the distinct ones).

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

Adding to 21440314540520 its reverse (2504541304412), we get a palindrome (23944855844932).

The spelling of 21440314540520 in words is "twenty-one trillion, four hundred forty billion, three hundred fourteen million, five hundred forty thousand, five hundred twenty".