21216023032450 has 48 divisors (see below), whose sum is σ = 41783681912040. Its totient is φ = 7987094635520.

The previous prime is 21216023032417. The next prime is 21216023032459. The reversal of 21216023032450 is 5423032061212.

It can be written as a sum of positive squares in 12 ways, for example, as 194522456209 + 21021500576241 = 441047^2 + 4584921^2 .

It is not an unprimeable number, because it can be changed into a prime (21216023032459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81290364 + ... + 81550936.

Almost surely, 2^{21216023032450} is an apocalyptic number.

21216023032450 is a deficient number, since it is larger than the sum of its proper divisors (20567658879590).

21216023032450 is a wasteful number, since it uses less digits than its factorization.

21216023032450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356391 (or 356386 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21216023032450 its reverse (5423032061212), we get a palindrome (26639055093662).

The spelling of 21216023032450 in words is "twenty-one trillion, two hundred sixteen billion, twenty-three million, thirty-two thousand, four hundred fifty".