10906721 has 4 divisors (see below), whose sum is σ = 12464832. Its totient is φ = 9348612.

The previous prime is 10906657. The next prime is 10906733. The reversal of 10906721 is 12760901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 10906721 - 2⁶ = 10906657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10906751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779045 + ... + 779058.

It is an arithmetic number, because the mean of its divisors is an integer number (3116208).

Almost surely, 2^10906721 is an apocalyptic number.

It is an amenable number.

10906721 is a deficient number, since it is larger than the sum of its proper divisors (1558111).

10906721 is an equidigital number, since it uses as much as digits as its factorization.

10906721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558110.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 10906721 is about 3302.5325130875. The cubic root of 10906721 is about 221.7675854066.

The spelling of 10906721 in words is "ten million, nine hundred six thousand, seven hundred twenty-one".