10153721 has 4 divisors (see below), whose sum is σ = 10179444. Its totient is φ = 10128000.

The previous prime is 10153699. The next prime is 10153727. The reversal of 10153721 is 12735101.

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 9388096 + 765625 = 3064^2 + 875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10153721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10153693 and 10153702.

It is not an unprimeable number, because it can be changed into a prime (10153727) 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, 12260 + ... + 13061.

It is an arithmetic number, because the mean of its divisors is an integer number (2544861).

Almost surely, 2^10153721 is an apocalyptic number.

It is an amenable number.

10153721 is a deficient number, since it is larger than the sum of its proper divisors (25723).

10153721 is an equidigital number, since it uses as much as digits as its factorization.

10153721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25722.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 10153721 is about 3186.4903891272. The cubic root of 10153721 is about 216.5417997153.

Adding to 10153721 its reverse (12735101), we get a palindrome (22888822).

The spelling of 10153721 in words is "ten million, one hundred fifty-three thousand, seven hundred twenty-one".