221001121121010 has 16 divisors (see below), whose sum is σ = 530402690690496. Its totient is φ = 58933632298928.

The previous prime is 221001121120987. The next prime is 221001121121159. The reversal of 221001121121010 is 10121121100122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3683352018654 + ... + 3683352018713.

It is an arithmetic number, because the mean of its divisors is an integer number (33150168168156).

Almost surely, 2^{221001121121010} is an apocalyptic number.

221001121121010 is an abundant number, since it is smaller than the sum of its proper divisors (309401569569486).

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

221001121121010 is a wasteful number, since it uses less digits than its factorization.

221001121121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7366704037377.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221001121121010 its reverse (10121121100122), we get a palindrome (231122242221132).

The spelling of 221001121121010 in words is "two hundred twenty-one trillion, one billion, one hundred twenty-one million, one hundred twenty-one thousand, ten".