121323113310 has 128 divisors (see below), whose sum is σ = 350314813440. Its totient is φ = 26290446336.

The previous prime is 121323113309. The next prime is 121323113311. The reversal of 121323113310 is 13311323121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121323113309) and next prime (121323113311).

It is a super-2 number, since 2×121323113310² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121323113311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 434646 + ... + 656934.

It is an arithmetic number, because the mean of its divisors is an integer number (2736834480).

Almost surely, 2^121323113310 is an apocalyptic number.

121323113310 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 121323113310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175157406720).

121323113310 is an abundant number, since it is smaller than the sum of its proper divisors (228991700130).

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

121323113310 is a wasteful number, since it uses less digits than its factorization.

121323113310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222442.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 121323113310 its reverse (13311323121), we get a palindrome (134634436431).

The spelling of 121323113310 in words is "one hundred twenty-one billion, three hundred twenty-three million, one hundred thirteen thousand, three hundred ten".