121221121210 has 32 divisors (see below), whose sum is σ = 249381250560. Its totient is φ = 41559512832.

The previous prime is 121221121207. The next prime is 121221121261. The reversal of 121221121210 is 12121122121.

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 15 ways as a sum of consecutive naturals, for example, 2533327 + ... + 2580733.

It is an arithmetic number, because the mean of its divisors is an integer number (7793164080).

Almost surely, 2^121221121210 is an apocalyptic number.

121221121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221121210 is an abundant number, since it is smaller than the sum of its proper divisors (128160129350).

121221121210 is a wasteful number, since it uses less digits than its factorization.

121221121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83950.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121221121210 its reverse (12121122121), we get a palindrome (133342243331).

The spelling of 121221121210 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred ten".