21403463520357 has 12 divisors (see below), whose sum is σ = 31014887505004. Its totient is φ = 14223387896640.

The previous prime is 21403463520353. The next prime is 21403463520359. The reversal of 21403463520357 is 75302536430412.

It is a happy number.

21403463520357 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 3 + 4 + 635 + 2 + 0 + 3 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1788494323716 + 19614969196641 = 1337346^2 + 4428879^2 .

It is not a de Polignac number, because 21403463520357 - 2² = 21403463520353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403463520353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3798978994 + ... + 3798984627.

Almost surely, 2^{21403463520357} is an apocalyptic number.

It is an amenable number.

21403463520357 is a deficient number, since it is larger than the sum of its proper divisors (9611423984647).

21403463520357 is a wasteful number, since it uses less digits than its factorization.

21403463520357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7597963940 (or 7597963937 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 45.

Adding to 21403463520357 its reverse (75302536430412), we get a palindrome (96705999950769).

The spelling of 21403463520357 in words is "twenty-one trillion, four hundred three billion, four hundred sixty-three million, five hundred twenty thousand, three hundred fifty-seven".