123221121140 has 36 divisors (see below), whose sum is σ = 280200462444. Its totient is φ = 45497028096.

The previous prime is 123221121139. The next prime is 123221121151. The reversal of 123221121140 is 41121122321.

It can be written as a sum of positive squares in 6 ways, for example, as 53256639076 + 69964482064 = 230774^2 + 264508^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18224597 + ... + 18231356.

It is an arithmetic number, because the mean of its divisors is an integer number (7783346179).

Almost surely, 2^123221121140 is an apocalyptic number.

123221121140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123221121140 is an abundant number, since it is smaller than the sum of its proper divisors (156979341304).

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

123221121140 is a wasteful number, since it uses less digits than its factorization.

123221121140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36455988 (or 36455973 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 123221121140 its reverse (41121122321), we get a palindrome (164342243461).

The spelling of 123221121140 in words is "one hundred twenty-three billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred forty".