121222221010111 has 16 divisors (see below), whose sum is σ = 137992872729600. Its totient is φ = 105564547535328.

The previous prime is 121222221010091. The next prime is 121222221010217. The reversal of 121222221010111 is 111010122222121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121222221010111 - 2³³ = 121213631075519 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222221050111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1026673651 + ... + 1026791716.

It is an arithmetic number, because the mean of its divisors is an integer number (8624554545600).

Almost surely, 2^{121222221010111} is an apocalyptic number.

121222221010111 is a deficient number, since it is larger than the sum of its proper divisors (16770651719489).

121222221010111 is a wasteful number, since it uses less digits than its factorization.

121222221010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053465638.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121222221010111 its reverse (111010122222121), we get a palindrome (232232343232232).

The spelling of 121222221010111 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, ten thousand, one hundred eleven".