221111121221110 has 16 divisors (see below), whose sum is σ = 418947387577200. Its totient is φ = 83789477515296.

The previous prime is 221111121221083. The next prime is 221111121221141. The reversal of 221111121221110 is 11122121111122.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent 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, 581871371445 + ... + 581871371824.

It is an arithmetic number, because the mean of its divisors is an integer number (26184211723575).

Almost surely, 2^{221111121221110} is an apocalyptic number.

221111121221110 is a deficient number, since it is larger than the sum of its proper divisors (197836266356090).

221111121221110 is a wasteful number, since it uses less digits than its factorization.

221111121221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163742743295.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 221111121221110 its reverse (11122121111122), we get a palindrome (232233242332232).

The spelling of 221111121221110 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred ten".