121210210 has 32 divisors (see below), whose sum is σ = 238469184. Its totient is φ = 43992000.

The previous prime is 121210183. The next prime is 121210213. The reversal of 121210210 is 12012121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (121210213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102925 + ... + 104095.

It is an arithmetic number, because the mean of its divisors is an integer number (7452162).

Almost surely, 2^121210210 is an apocalyptic number.

121210210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121210210 is a deficient number, since it is larger than the sum of its proper divisors (117258974).

121210210 is a wasteful number, since it uses less digits than its factorization.

121210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121210210 is about 11009.5508536906. The cubic root of 121210210 is about 494.8950020470.

Adding to 121210210 its reverse (12012121), we get a palindrome (133222331).

The spelling of 121210210 in words is "one hundred twenty-one million, two hundred ten thousand, two hundred ten".