10640421 has 24 divisors (see below), whose sum is σ = 17499456. Its totient is φ = 6167040.

The previous prime is 10640387. The next prime is 10640429. The reversal of 10640421 is 12404601.

10640421 is a `hidden beast` number, since 1 + 0 + 640 + 4 + 21 = 666.

It is not a de Polignac number, because 10640421 - 2⁷ = 10640293 is a prime.

It is a super-2 number, since 2×10640421² = 226437118114482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10640394 and 10640403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10640429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60 + ... + 4613.

It is an arithmetic number, because the mean of its divisors is an integer number (729144).

Almost surely, 2^10640421 is an apocalyptic number.

10640421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10640421 is a deficient number, since it is larger than the sum of its proper divisors (6859035).

10640421 is a wasteful number, since it uses less digits than its factorization.

10640421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4713 (or 4710 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 10640421 is about 3261.9658183372. The cubic root of 10640421 is about 219.9477906412.

The spelling of 10640421 in words is "ten million, six hundred forty thousand, four hundred twenty-one".