21212201202210 has 48 divisors (see below), whose sum is σ = 56930810976000. Its totient is φ = 5474116438560.

The previous prime is 21212201202209. The next prime is 21212201202251. The reversal of 21212201202210 is 1220210221212.

It is a happy number.

21212201202210 is a `hidden beast` number, since 21 + 212 + 20 + 1 + 202 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3801466960 + ... + 3801472539.

It is an arithmetic number, because the mean of its divisors is an integer number (1186058562000).

Almost surely, 2^{21212201202210} is an apocalyptic number.

21212201202210 is an abundant number, since it is smaller than the sum of its proper divisors (35718609773790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212201202210 is a wasteful number, since it uses less digits than its factorization.

21212201202210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602939543 (or 7602939540 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21212201202210 its reverse (1220210221212), we get a palindrome (22432411423422).

The spelling of 21212201202210 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred two thousand, two hundred ten".