21445012500243 has 8 divisors (see below), whose sum is σ = 29366143243728. Its totient is φ = 13910278378464.

The previous prime is 21445012500203. The next prime is 21445012500269. The reversal of 21445012500243 is 34200521054412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21445012500243 - 2¹⁴ = 21445012483859 is a prime.

It is a super-2 number, since 2×21445012500243² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21445012500203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96599155296 + ... + 96599155517.

It is an arithmetic number, because the mean of its divisors is an integer number (3670767905466).

Almost surely, 2^{21445012500243} is an apocalyptic number.

21445012500243 is a deficient number, since it is larger than the sum of its proper divisors (7921130743485).

21445012500243 is a wasteful number, since it uses less digits than its factorization.

21445012500243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193198310853.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 21445012500243 its reverse (34200521054412), we get a palindrome (55645533554655).

The spelling of 21445012500243 in words is "twenty-one trillion, four hundred forty-five billion, twelve million, five hundred thousand, two hundred forty-three".