42721433412725 has 12 divisors (see below), whose sum is σ = 52974661281540. Its totient is φ = 34177092633600.

The previous prime is 42721433412709. The next prime is 42721433412727. The reversal of 42721433412725 is 52721433412724.

It can be written as a sum of positive squares in 6 ways, for example, as 19722481 + 42721413690244 = 4441^2 + 6536162^2 .

It is not a de Polignac number, because 42721433412725 - 2⁴ = 42721433412709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42721433412725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721433412727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24294491 + ... + 25993559.

It is an arithmetic number, because the mean of its divisors is an integer number (4414555106795).

Almost surely, 2^{42721433412725} is an apocalyptic number.

It is an amenable number.

42721433412725 is a deficient number, since it is larger than the sum of its proper divisors (10253227868815).

42721433412725 is a wasteful number, since it uses less digits than its factorization.

42721433412725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704840 (or 2704835 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 47.

Subtracting 42721433412725 from its reverse (52721433412724), we obtain a palindrome (9999999999999).

The spelling of 42721433412725 in words is "forty-two trillion, seven hundred twenty-one billion, four hundred thirty-three million, four hundred twelve thousand, seven hundred twenty-five".