20021210 has 16 divisors (see below), whose sum is σ = 39314592. Its totient is φ = 7280400.

The previous prime is 20021203. The next prime is 20021213. The reversal of 20021210 is 1212002.

It is not an unprimeable number, because it can be changed into a prime (20021213) 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, 90896 + ... + 91115.

It is an arithmetic number, because the mean of its divisors is an integer number (2457162).

Almost surely, 2^20021210 is an apocalyptic number.

20021210 is a deficient number, since it is larger than the sum of its proper divisors (19293382).

20021210 is a wasteful number, since it uses less digits than its factorization.

20021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182029.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20021210 is about 4474.5066767187. The cubic root of 20021210 is about 271.5376824222.

Adding to 20021210 its reverse (1212002), we get a palindrome (21233212).

The spelling of 20021210 in words is "twenty million, twenty-one thousand, two hundred ten".