10145721 has 8 divisors (see below), whose sum is σ = 13842400. Its totient is φ = 6606432.

The previous prime is 10145717. The next prime is 10145747. The reversal of 10145721 is 12754101.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10145721 - 2² = 10145717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10145761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39196 + ... + 39453.

It is an arithmetic number, because the mean of its divisors is an integer number (1730300).

Almost surely, 2^10145721 is an apocalyptic number.

It is an amenable number.

10145721 is a deficient number, since it is larger than the sum of its proper divisors (3696679).

10145721 is an equidigital number, since it uses as much as digits as its factorization.

10145721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78695.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 10145721 is about 3185.2348422055. The cubic root of 10145721 is about 216.4849145084.

Adding to 10145721 its reverse (12754101), we get a palindrome (22899822).

The spelling of 10145721 in words is "ten million, one hundred forty-five thousand, seven hundred twenty-one".