121221021212010 has 96 divisors (see below), whose sum is σ = 318998662976448. Its totient is φ = 31933464986880.

The previous prime is 121221021211949. The next prime is 121221021212023. The reversal of 121221021212010 is 10212120122121.

121221021212010 is a `hidden beast` number, since 1 + 212 + 210 + 21 + 21 + 201 + 0 = 666.

121221021212010 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89287470 + ... + 90634950.

It is an arithmetic number, because the mean of its divisors is an integer number (3322902739338).

Almost surely, 2^{121221021212010} is an apocalyptic number.

121221021212010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121221021212010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159499331488224).

121221021212010 is an abundant number, since it is smaller than the sum of its proper divisors (197777641764438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221021212010 is a wasteful number, since it uses less digits than its factorization.

121221021212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359620 (or 1359617 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121221021212010 its reverse (10212120122121), we get a palindrome (131433141334131).

The spelling of 121221021212010 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twelve thousand, ten".