121221222220010 has 48 divisors (see below), whose sum is σ = 239882930396928. Its totient is φ = 44072129750880.

The previous prime is 121221222219949. The next prime is 121221222220019. The reversal of 121221222220010 is 10022222122121.

It is not an unprimeable number, because it can be changed into a prime (121221222220019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3029234 + ... + 15862493.

It is an arithmetic number, because the mean of its divisors is an integer number (4997561049936).

Almost surely, 2^{121221222220010} is an apocalyptic number.

121221222220010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221222220010 is a deficient number, since it is larger than the sum of its proper divisors (118661708176918).

121221222220010 is a wasteful number, since it uses less digits than its factorization.

121221222220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18897059 (or 18897048 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121221222220010 its reverse (10022222122121), we get a palindrome (131243444342131).

The spelling of 121221222220010 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, ten".