10721806 has 4 divisors (see below), whose sum is σ = 16082712. Its totient is φ = 5360902.

The previous prime is 10721803. The next prime is 10721807. The reversal of 10721806 is 60812701.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×10721806² = 229914247803272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10721803) 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 as a sum of consecutive naturals, namely, 2680450 + ... + 2680453.

It is an arithmetic number, because the mean of its divisors is an integer number (4020678).

Almost surely, 2^10721806 is an apocalyptic number.

10721806 is a deficient number, since it is larger than the sum of its proper divisors (5360906).

10721806 is an equidigital number, since it uses as much as digits as its factorization.

10721806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360905.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 10721806 is about 3274.4168946547. The cubic root of 10721806 is about 220.5071358561.

The spelling of 10721806 in words is "ten million, seven hundred twenty-one thousand, eight hundred six".