121111221211210 has 16 divisors (see below), whose sum is σ = 229473892821600. Its totient is φ = 45894778564176.

The previous prime is 121111221211199. The next prime is 121111221211231. The reversal of 121111221211210 is 12112122111121.

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

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, 318713739840 + ... + 318713740219.

It is an arithmetic number, because the mean of its divisors is an integer number (14342118301350).

Almost surely, 2^{121111221211210} is an apocalyptic number.

121111221211210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121111221211210 is a deficient number, since it is larger than the sum of its proper divisors (108362671610390).

121111221211210 is a wasteful number, since it uses less digits than its factorization.

121111221211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637427480085.

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

Adding to 121111221211210 its reverse (12112122111121), we get a palindrome (133223343322331).

The spelling of 121111221211210 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred ten".