21224535011345 has 16 divisors (see below), whose sum is σ = 25583308489728. Its totient is φ = 16903726771200.

The previous prime is 21224535011341. The next prime is 21224535011353. The reversal of 21224535011345 is 54311053542212.

It is not a de Polignac number, because 21224535011345 - 2² = 21224535011341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21224535011299 and 21224535011308.

It is not an unprimeable number, because it can be changed into a prime (21224535011341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17049137 + ... + 18251633.

It is an arithmetic number, because the mean of its divisors is an integer number (1598956780608).

Almost surely, 2^{21224535011345} is an apocalyptic number.

It is an amenable number.

21224535011345 is a deficient number, since it is larger than the sum of its proper divisors (4358773478383).

21224535011345 is a wasteful number, since it uses less digits than its factorization.

21224535011345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218280.

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 21224535011345 its reverse (54311053542212), we get a palindrome (75535588553557).

The spelling of 21224535011345 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred thirty-five million, eleven thousand, three hundred forty-five".