121110121210 has 16 divisors (see below), whose sum is σ = 234767312136. Its totient is φ = 44717583168.

The previous prime is 121110121199. The next prime is 121110121213. The reversal of 121110121210 is 12121011121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 102985153569 + 18124967641 = 320913^2 + 134629^2 .

It is a super-2 number, since 2×121110121210² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (121110121213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465808029 + ... + 465808288.

Almost surely, 2^121110121210 is an apocalyptic number.

121110121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121110121210 is a deficient number, since it is larger than the sum of its proper divisors (113657190926).

121110121210 is a wasteful number, since it uses less digits than its factorization.

121110121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931616337.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121110121210 its reverse (12121011121), we get a palindrome (133231132331).

The spelling of 121110121210 in words is "one hundred twenty-one billion, one hundred ten million, one hundred twenty-one thousand, two hundred ten".