121221010010 has 16 divisors (see below), whose sum is σ = 221896087200. Its totient is φ = 47666566416.

The previous prime is 121221010007. The next prime is 121221010039. The reversal of 121221010010 is 10010122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221009973 and 121221010000.

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 7 ways as a sum of consecutive naturals, for example, 102729080 + ... + 102730259.

It is an arithmetic number, because the mean of its divisors is an integer number (13868505450).

Almost surely, 2^121221010010 is an apocalyptic number.

121221010010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221010010 is a deficient number, since it is larger than the sum of its proper divisors (100675077190).

121221010010 is a wasteful number, since it uses less digits than its factorization.

121221010010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205459405.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121221010010 its reverse (10010122121), we get a palindrome (131231132131).

The spelling of 121221010010 in words is "one hundred twenty-one billion, two hundred twenty-one million, ten thousand, ten".