10249421785 has 4 divisors (see below), whose sum is σ = 12299306148. Its totient is φ = 8199537424.

The previous prime is 10249421783. The next prime is 10249421813. The reversal of 10249421785 is 58712494201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58712494201 = 181 ⋅324378421.

It can be written as a sum of positive squares in 2 ways, for example, as 4282786249 + 5966635536 = 65443^2 + 77244^2 .

It is a cyclic number.

It is not a de Polignac number, because 10249421785 - 2¹ = 10249421783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10249421783) 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, 1024942174 + ... + 1024942183.

It is an arithmetic number, because the mean of its divisors is an integer number (3074826537).

Almost surely, 2^10249421785 is an apocalyptic number.

It is an amenable number.

10249421785 is a deficient number, since it is larger than the sum of its proper divisors (2049884363).

10249421785 is an equidigital number, since it uses as much as digits as its factorization.

10249421785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049884362.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 10249421785 in words is "ten billion, two hundred forty-nine million, four hundred twenty-one thousand, seven hundred eighty-five".