221121021211110 has 48 divisors (see below), whose sum is σ = 574918554594384. Its totient is φ = 58965205713216.

The previous prime is 221121021211091. The next prime is 221121021211157. The reversal of 221121021211110 is 11112120121122.

It is a happy number.

221121021211110 is a `hidden beast` number, since 2 + 211 + 210 + 21 + 211 + 1 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5130904 + ... + 21646436.

It is an arithmetic number, because the mean of its divisors is an integer number (11977469887383).

Almost surely, 2^{221121021211110} is an apocalyptic number.

221121021211110 is an abundant number, since it is smaller than the sum of its proper divisors (353797533383274).

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

221121021211110 is a wasteful number, since it uses less digits than its factorization.

221121021211110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16664309 (or 16664306 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221121021211110 its reverse (11112120121122), we get a palindrome (232233141332232).

The spelling of 221121021211110 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred eleven thousand, one hundred ten".