21425223730273 has 6 divisors (see below), whose sum is σ = 23550039306962. Its totient is φ = 19477476118320.

The previous prime is 21425223730243. The next prime is 21425223730277. The reversal of 21425223730273 is 37203732252412.

It can be written as a sum of positive squares in only one way, i.e., 14463288181969 + 6961935548304 = 3803063^2 + 2638548^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21425223730273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21425223730277) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88533982236 + ... + 88533982477.

Almost surely, 2^{21425223730273} is an apocalyptic number.

It is an amenable number.

21425223730273 is a deficient number, since it is larger than the sum of its proper divisors (2124815576689).

21425223730273 is a wasteful number, since it uses less digits than its factorization.

21425223730273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177067964735 (or 177067964724 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 43.

Adding to 21425223730273 its reverse (37203732252412), we get a palindrome (58628955982685).

The spelling of 21425223730273 in words is "twenty-one trillion, four hundred twenty-five billion, two hundred twenty-three million, seven hundred thirty thousand, two hundred seventy-three".