21210334210 has 32 divisors (see below), whose sum is σ = 41812303680. Its totient is φ = 7698767808.

The previous prime is 21210334207. The next prime is 21210334213. The reversal of 21210334210 is 1243301212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21210334207) and next prime (21210334213).

It is not an unprimeable number, because it can be changed into a prime (21210334213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1375012 + ... + 1390351.

It is an arithmetic number, because the mean of its divisors is an integer number (1306634490).

Almost surely, 2^21210334210 is an apocalyptic number.

21210334210 is a deficient number, since it is larger than the sum of its proper divisors (20601969470).

21210334210 is a wasteful number, since it uses less digits than its factorization.

21210334210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765442.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21210334210 its reverse (1243301212), we get a palindrome (22453635422).

The spelling of 21210334210 in words is "twenty-one billion, two hundred ten million, three hundred thirty-four thousand, two hundred ten".