21530440241012 has 24 divisors (see below), whose sum is σ = 39054097895400. Its totient is φ = 10373585161856.

The previous prime is 21530440240999. The next prime is 21530440241081. The reversal of 21530440241012 is 21014204403512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10889300411236 + 10641139829776 = 3299894^2 + 3262076^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182266343 + ... + 182384430.

It is an arithmetic number, because the mean of its divisors is an integer number (1627254078975).

Almost surely, 2^{21530440241012} is an apocalyptic number.

It is an amenable number.

21530440241012 is a deficient number, since it is larger than the sum of its proper divisors (17523657654388).

21530440241012 is a wasteful number, since it uses less digits than its factorization.

21530440241012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364651315 (or 364651313 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 21530440241012 its reverse (21014204403512), we get a palindrome (42544644644524).

The spelling of 21530440241012 in words is "twenty-one trillion, five hundred thirty billion, four hundred forty million, two hundred forty-one thousand, twelve".