121111221210 has 64 divisors (see below), whose sum is σ = 346633869312. Its totient is φ = 26478974016.

The previous prime is 121111221191. The next prime is 121111221221. The reversal of 121111221210 is 12122111121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121111221210.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12532564 + ... + 12542223.

It is an arithmetic number, because the mean of its divisors is an integer number (5416154208).

Almost surely, 2^121111221210 is an apocalyptic number.

121111221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121111221210 is an abundant number, since it is smaller than the sum of its proper divisors (225522648102).

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

121111221210 is a wasteful number, since it uses less digits than its factorization.

121111221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25074827.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121111221210 its reverse (12122111121), we get a palindrome (133233332331).

It can be divided in two parts, 12111 and 1221210, that added together give a palindrome (1233321).

The spelling of 121111221210 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred ten".