221021122121210 has 32 divisors (see below), whose sum is σ = 418404107169792. Its totient is φ = 83898740217600.

The previous prime is 221021122121171. The next prime is 221021122121251. The reversal of 221021122121210 is 12121221120122.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3783283391 + ... + 3783341810.

It is an arithmetic number, because the mean of its divisors is an integer number (13075128349056).

Almost surely, 2^{221021122121210} is an apocalyptic number.

221021122121210 is a deficient number, since it is larger than the sum of its proper divisors (197382985048582).

221021122121210 is a wasteful number, since it uses less digits than its factorization.

221021122121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7566625358.

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

Adding to 221021122121210 its reverse (12121221120122), we get a palindrome (233142343241332).

The spelling of 221021122121210 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred ten".