10649821 has 16 divisors (see below), whose sum is σ = 13465984. Its totient is φ = 8195904.

The previous prime is 10649801. The next prime is 10649827. The reversal of 10649821 is 12894601.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 10649821 - 2⁵ = 10649789 is a prime.

It is a super-2 number, since 2×10649821² = 226837374664082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10649827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1786 + ... + 4948.

It is an arithmetic number, because the mean of its divisors is an integer number (841624).

Almost surely, 2^10649821 is an apocalyptic number.

It is an amenable number.

10649821 is a deficient number, since it is larger than the sum of its proper divisors (2816163).

10649821 is a wasteful number, since it uses less digits than its factorization.

10649821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 10649821 is about 3263.4063492002. The cubic root of 10649821 is about 220.0125406075.

The spelling of 10649821 in words is "ten million, six hundred forty-nine thousand, eight hundred twenty-one".