21365265352450 has 48 divisors (see below), whose sum is σ = 42228907951464. Its totient is φ = 8014356403200.

The previous prime is 21365265352439. The next prime is 21365265352511. The reversal of 21365265352450 is 5425356256312.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 5798555504361 + 15566709848089 = 2408019^2 + 3945467^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21365265352394 and 21365265352403.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45135681 + ... + 45606580.

Almost surely, 2^{21365265352450} is an apocalyptic number.

21365265352450 is a deficient number, since it is larger than the sum of its proper divisors (20863642599014).

21365265352450 is a wasteful number, since it uses less digits than its factorization.

21365265352450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90742567 (or 90742562 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 49.

The spelling of 21365265352450 in words is "twenty-one trillion, three hundred sixty-five billion, two hundred sixty-five million, three hundred fifty-two thousand, four hundred fifty".