10500721 has 8 divisors (see below), whose sum is σ = 13091904. Its totient is φ = 8182320.

The previous prime is 10500703. The next prime is 10500739. The reversal of 10500721 is 12700501.

It is an interprime number because it is at equal distance from previous prime (10500703) and next prime (10500739).

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

It is a cyclic number.

It is not a de Polignac number, because 10500721 - 2⁷ = 10500593 is a prime.

It is a super-2 number, since 2×10500721² = 220530283039682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10500695 and 10500704.

It is not an unprimeable number, because it can be changed into a prime (10500701) 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, 68110 + ... + 68263.

It is an arithmetic number, because the mean of its divisors is an integer number (1636488).

Almost surely, 2^10500721 is an apocalyptic number.

10500721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10500721 is a deficient number, since it is larger than the sum of its proper divisors (2591183).

10500721 is a wasteful number, since it uses less digits than its factorization.

10500721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136391.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 10500721 is about 3240.4816000095. The cubic root of 10500721 is about 218.9809689960.

The spelling of 10500721 in words is "ten million, five hundred thousand, seven hundred twenty-one".