221212021020210 has 48 divisors (see below), whose sum is σ = 627437732351040. Its totient is φ = 53627156610720.

The previous prime is 221212021020181. The next prime is 221212021020251. The reversal of 221212021020210 is 12020120212122.

It is a happy number.

221212021020210 is a `hidden beast` number, since 2 + 212 + 12 + 0 + 210 + 20 + 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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111723241950 + ... + 111723243929.

It is an arithmetic number, because the mean of its divisors is an integer number (13071619423980).

Almost surely, 2^{221212021020210} is an apocalyptic number.

221212021020210 is an abundant number, since it is smaller than the sum of its proper divisors (406225711330830).

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

221212021020210 is a wasteful number, since it uses less digits than its factorization.

221212021020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223446485903 (or 223446485900 counting only the distinct ones).

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

Adding to 221212021020210 its reverse (12020120212122), we get a palindrome (233232141232332).

The spelling of 221212021020210 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-one million, twenty thousand, two hundred ten".