121355321010 has 128 divisors (see below), whose sum is σ = 363616819200. Its totient is φ = 25182213120.

The previous prime is 121355320997. The next prime is 121355321011. The reversal of 121355321010 is 10123553121.

It is a super-2 number, since 2×121355321010² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121355321011) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 1671546 + ... + 1742634.

It is an arithmetic number, because the mean of its divisors is an integer number (2840756400).

Almost surely, 2^121355321010 is an apocalyptic number.

121355321010 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 121355321010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181808409600).

121355321010 is an abundant number, since it is smaller than the sum of its proper divisors (242261498190).

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

121355321010 is a wasteful number, since it uses less digits than its factorization.

121355321010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71856.

The product of its (nonzero) digits is 900, while the sum is 24.

Adding to 121355321010 its reverse (10123553121), we get a palindrome (131478874131).

The spelling of 121355321010 in words is "one hundred twenty-one billion, three hundred fifty-five million, three hundred twenty-one thousand, ten".