21210010 has 16 divisors (see below), whose sum is σ = 38455200. Its totient is φ = 8422416.

The previous prime is 21209963. The next prime is 21210011. The reversal of 21210010 is 1001212.

It is a junction number, because it is equal to n+sod(n) for n = 21209975 and 21210002.

It is not an unprimeable number, because it can be changed into a prime (21210011) 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, 6240 + ... + 9019.

It is an arithmetic number, because the mean of its divisors is an integer number (2403450).

Almost surely, 2^21210010 is an apocalyptic number.

21210010 is a deficient number, since it is larger than the sum of its proper divisors (17245190).

21210010 is a wasteful number, since it uses less digits than its factorization.

21210010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15405.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 21210010 is about 4605.4326615422. The cubic root of 21210010 is about 276.8090539795.

Adding to 21210010 its reverse (1001212), we get a palindrome (22211222).

The spelling of 21210010 in words is "twenty-one million, two hundred ten thousand, ten".