221121020211 has 32 divisors (see below), whose sum is σ = 363649198080. Its totient is φ = 116383284864.

The previous prime is 221121020207. The next prime is 221121020221. The reversal of 221121020211 is 112020121122.

It is not a de Polignac number, because 221121020211 - 2² = 221121020207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121020221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 748296 + ... + 1001093.

It is an arithmetic number, because the mean of its divisors is an integer number (11364037440).

Almost surely, 2^221121020211 is an apocalyptic number.

221121020211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221121020211 is a deficient number, since it is larger than the sum of its proper divisors (142528177869).

221121020211 is a wasteful number, since it uses less digits than its factorization.

221121020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749875.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221121020211 its reverse (112020121122), we get a palindrome (333141141333).

The spelling of 221121020211 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred eleven".