121221210010 has 32 divisors (see below), whose sum is σ = 219500305920. Its totient is φ = 48199766208.

The previous prime is 121221209999. The next prime is 121221210017. The reversal of 121221210010 is 10012122121.

It is not an unprimeable number, because it can be changed into a prime (121221210017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1483296 + ... + 1562884.

It is an arithmetic number, because the mean of its divisors is an integer number (6859384560).

Almost surely, 2^121221210010 is an apocalyptic number.

121221210010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221210010 is a deficient number, since it is larger than the sum of its proper divisors (98279095910).

121221210010 is a wasteful number, since it uses less digits than its factorization.

121221210010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80502.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121221210010 its reverse (10012122121), we get a palindrome (131233332131).

The spelling of 121221210010 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred ten thousand, ten".