10245257021 has 4 divisors (see below), whose sum is σ = 10272724572. Its totient is φ = 10217789472.

The previous prime is 10245257003. The next prime is 10245257027. The reversal of 10245257021 is 12075254201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5433753796 + 4811503225 = 73714^2 + 69365^2 .

It is a cyclic number.

It is not a de Polignac number, because 10245257021 - 2¹⁰ = 10245255997 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 (10245257027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13733216 + ... + 13733961.

It is an arithmetic number, because the mean of its divisors is an integer number (2568181143).

Almost surely, 2^10245257021 is an apocalyptic number.

It is an amenable number.

10245257021 is a deficient number, since it is larger than the sum of its proper divisors (27467551).

10245257021 is an equidigital number, since it uses as much as digits as its factorization.

10245257021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27467550.

The product of its (nonzero) digits is 5600, while the sum is 29.

The spelling of 10245257021 in words is "ten billion, two hundred forty-five million, two hundred fifty-seven thousand, twenty-one".