10885721 has 16 divisors (see below), whose sum is σ = 13706880. Its totient is φ = 8398080.

The previous prime is 10885709. The next prime is 10885753. The reversal of 10885721 is 12758801.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 10885721 - 2⁶ = 10885657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10885621) 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 15 ways as a sum of consecutive naturals, for example, 7745 + ... + 9041.

It is an arithmetic number, because the mean of its divisors is an integer number (856680).

Almost surely, 2^10885721 is an apocalyptic number.

10885721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10885721 is a deficient number, since it is larger than the sum of its proper divisors (2821159).

10885721 is a wasteful number, since it uses less digits than its factorization.

10885721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 10885721 is about 3299.3516029669. The cubic root of 10885721 is about 221.6251621717.

Subtracting 10885721 from its reverse (12758801), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 10885721 in words is "ten million, eight hundred eighty-five thousand, seven hundred twenty-one".