21032210 has 16 divisors (see below), whose sum is σ = 37933056. Its totient is φ = 8396208.

The previous prime is 21032201. The next prime is 21032237. The reversal of 21032210 is 1223012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21032191 and 21032200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4079 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (2370816).

Almost surely, 2^21032210 is an apocalyptic number.

21032210 is a deficient number, since it is larger than the sum of its proper divisors (16900846).

21032210 is a wasteful number, since it uses less digits than its factorization.

21032210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4177.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21032210 is about 4586.0887475059. The cubic root of 21032210 is about 276.0334010547.

Adding to 21032210 its reverse (1223012), we get a palindrome (22255222).

The spelling of 21032210 in words is "twenty-one million, thirty-two thousand, two hundred ten".