21210355210 has 16 divisors (see below), whose sum is σ = 41649424992. Its totient is φ = 7712856400.

The previous prime is 21210355181. The next prime is 21210355219. The reversal of 21210355210 is 1255301212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21210355219) 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, 96410596 + ... + 96410815.

It is an arithmetic number, because the mean of its divisors is an integer number (2603089062).

Almost surely, 2^21210355210 is an apocalyptic number.

21210355210 is a deficient number, since it is larger than the sum of its proper divisors (20439069782).

21210355210 is a wasteful number, since it uses less digits than its factorization.

21210355210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192821429.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 21210355210 its reverse (1255301212), we get a palindrome (22465656422).

The spelling of 21210355210 in words is "twenty-one billion, two hundred ten million, three hundred fifty-five thousand, two hundred ten".