10639021 has 2 divisors, whose sum is σ = 10639022. Its totient is φ = 10639020.

The previous prime is 10639019. The next prime is 10639033. The reversal of 10639021 is 12093601.

10639021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10634121 + 4900 = 3261^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 10639021 - 2¹ = 10639019 is a prime.

It is a super-2 number, since 2×10639021² = 226377535676882, which contains 22 as substring.

Together with 10639019, it forms a pair of twin primes.

It is equal to p₇₀₄₁₉₁ and since 10639021 and 704191 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 10638983 and 10639001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10639001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5319510 + 5319511.

It is an arithmetic number, because the mean of its divisors is an integer number (5319511).

Almost surely, 2^10639021 is an apocalyptic number.

It is an amenable number.

10639021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10639021 is an equidigital number, since it uses as much as digits as its factorization.

10639021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 10639021 is about 3261.7512167546. The cubic root of 10639021 is about 219.9381437669.

The spelling of 10639021 in words is "ten million, six hundred thirty-nine thousand, twenty-one".