10021209 has 16 divisors (see below), whose sum is σ = 14826240. Its totient is φ = 5969360.

The previous prime is 10021163. The next prime is 10021213. The reversal of 10021209 is 90212001.

It is a happy number.

10021209 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 10021209 - 2¹¹ = 10019161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10021259) 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, 627 + ... + 4520.

It is an arithmetic number, because the mean of its divisors is an integer number (926640).

Almost surely, 2^10021209 is an apocalyptic number.

It is an amenable number.

10021209 is a deficient number, since it is larger than the sum of its proper divisors (4805031).

10021209 is a wasteful number, since it uses less digits than its factorization.

10021209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 10021209 is about 3165.6293213199. The cubic root of 10021209 is about 215.5956728020.

It can be divided in two parts, 1002 and 1209, that added together give a triangular number (2211 = T₆₆).

The spelling of 10021209 in words is "ten million, twenty-one thousand, two hundred nine".