10209021 has 8 divisors (see below), whose sum is σ = 13835424. Its totient is φ = 6694320.

The previous prime is 10209007. The next prime is 10209029. The reversal of 10209021 is 12090201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10209021 - 2⁹ = 10208509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10209029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27711 + ... + 28076.

It is an arithmetic number, because the mean of its divisors is an integer number (1729428).

Almost surely, 2^10209021 is an apocalyptic number.

It is an amenable number.

10209021 is a deficient number, since it is larger than the sum of its proper divisors (3626403).

10209021 is an equidigital number, since it uses as much as digits as its factorization.

10209021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55851.

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

The square root of 10209021 is about 3195.1558647428. The cubic root of 10209021 is about 216.9342038977.

Adding to 10209021 its reverse (12090201), we get a palindrome (22299222).

The spelling of 10209021 in words is "ten million, two hundred nine thousand, twenty-one".