221011211221210 has 16 divisors (see below), whose sum is σ = 397820775614976. Its totient is φ = 88404352173648.

The previous prime is 221011211221193. The next prime is 221011211221267. The reversal of 221011211221210 is 12122112110122.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 9376182 + ... + 23020321.

It is an arithmetic number, because the mean of its divisors is an integer number (24863798475936).

Almost surely, 2^{221011211221210} is an apocalyptic number.

221011211221210 is a deficient number, since it is larger than the sum of its proper divisors (176809564393766).

221011211221210 is a wasteful number, since it uses less digits than its factorization.

221011211221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33078717.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221011211221210 its reverse (12122112110122), we get a palindrome (233133323331332).

The spelling of 221011211221210 in words is "two hundred twenty-one trillion, eleven billion, two hundred eleven million, two hundred twenty-one thousand, two hundred ten".