10121645 has 4 divisors (see below), whose sum is σ = 12145980. Its totient is φ = 8097312.

The previous prime is 10121621. The next prime is 10121651. The reversal of 10121645 is 54612101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54612101 = 53 ⋅1030417.

It can be written as a sum of positive squares in 2 ways, for example, as 2157961 + 7963684 = 1469^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121645 - 2¹⁴ = 10105261 is a prime.

It is a super-3 number, since 3×10121645³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1012160 + ... + 1012169.

It is an arithmetic number, because the mean of its divisors is an integer number (3036495).

Almost surely, 2^10121645 is an apocalyptic number.

It is an amenable number.

10121645 is a deficient number, since it is larger than the sum of its proper divisors (2024335).

10121645 is an equidigital number, since it uses as much as digits as its factorization.

10121645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024334.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 10121645 is about 3181.4532842712. The cubic root of 10121645 is about 216.3135378579.

Adding to 10121645 its reverse (54612101), we get a palindrome (64733746).

The spelling of 10121645 in words is "ten million, one hundred twenty-one thousand, six hundred forty-five".