221211221021210 has 64 divisors (see below), whose sum is σ = 456490405997568. Its totient is φ = 75606129817344.

The previous prime is 221211221021209. The next prime is 221211221021267. The reversal of 221211221021210 is 12120122112122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60839852 + ... + 64373208.

It is an arithmetic number, because the mean of its divisors is an integer number (7132662593712).

Almost surely, 2^{221211221021210} is an apocalyptic number.

221211221021210 is an abundant number, since it is smaller than the sum of its proper divisors (235279184976358).

221211221021210 is a wasteful number, since it uses less digits than its factorization.

221211221021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3536175.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221211221021210 its reverse (12120122112122), we get a palindrome (233331343133332).

The spelling of 221211221021210 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred ten".