21130380650440 has 16 divisors (see below), whose sum is σ = 47543356463580. Its totient is φ = 8452152260160.

The previous prime is 21130380650419. The next prime is 21130380650443. The reversal of 21130380650440 is 4405608303112.

It can be written as a sum of positive squares in 2 ways, for example, as 20569508471044 + 560872179396 = 4535362^2 + 748914^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21130380650440.

It is not an unprimeable number, because it can be changed into a prime (21130380650443) 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, 264129758091 + ... + 264129758170.

Almost surely, 2^{21130380650440} is an apocalyptic number.

21130380650440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130380650440 is an abundant number, since it is smaller than the sum of its proper divisors (26412975813140).

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

21130380650440 is a wasteful number, since it uses less digits than its factorization.

21130380650440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528259516272 (or 528259516268 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21130380650440 its reverse (4405608303112), we get a palindrome (25535988953552).

The spelling of 21130380650440 in words is "twenty-one trillion, one hundred thirty billion, three hundred eighty million, six hundred fifty thousand, four hundred forty".