10721345 has 4 divisors (see below), whose sum is σ = 12865620. Its totient is φ = 8577072.

The previous prime is 10721341. The next prime is 10721351. The reversal of 10721345 is 54312701.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54312701 = 227 ⋅239263.

It can be written as a sum of positive squares in 2 ways, for example, as 4330561 + 6390784 = 2081^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 10721345 - 2² = 10721341 is a prime.

It is a super-2 number, since 2×10721345² = 229894477218050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10721345.

It is not an unprimeable number, because it can be changed into a prime (10721341) 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, 1072130 + ... + 1072139.

It is an arithmetic number, because the mean of its divisors is an integer number (3216405).

Almost surely, 2^10721345 is an apocalyptic number.

It is an amenable number.

10721345 is a deficient number, since it is larger than the sum of its proper divisors (2144275).

10721345 is an equidigital number, since it uses as much as digits as its factorization.

10721345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144274.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 10721345 is about 3274.3464996851. The cubic root of 10721345 is about 220.5039754666.

The spelling of 10721345 in words is "ten million, seven hundred twenty-one thousand, three hundred forty-five".