225724601021 has 4 divisors (see below), whose sum is σ = 237604843200. Its totient is φ = 213844358844.

The previous prime is 225724600979. The next prime is 225724601051. The reversal of 225724601021 is 120106427522.

225724601021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 225724601021 - 2¹⁴ = 225724584637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225724601051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5940121061 + ... + 5940121098.

It is an arithmetic number, because the mean of its divisors is an integer number (59401210800).

Almost surely, 2^225724601021 is an apocalyptic number.

It is an amenable number.

225724601021 is a deficient number, since it is larger than the sum of its proper divisors (11880242179).

225724601021 is a wasteful number, since it uses less digits than its factorization.

225724601021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11880242178.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 225724601021 in words is "two hundred twenty-five billion, seven hundred twenty-four million, six hundred one thousand, twenty-one".