123111020130 has 128 divisors (see below), whose sum is σ = 353479458816. Its totient is φ = 26848281600.

The previous prime is 123111020107. The next prime is 123111020147. The reversal of 123111020130 is 31020111321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 329034 + ... + 595386.

It is an arithmetic number, because the mean of its divisors is an integer number (2761558272).

Almost surely, 2^123111020130 is an apocalyptic number.

123111020130 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 123111020130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176739729408).

123111020130 is an abundant number, since it is smaller than the sum of its proper divisors (230368438686).

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

123111020130 is a wasteful number, since it uses less digits than its factorization.

123111020130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266472.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 123111020130 its reverse (31020111321), we get a palindrome (154131131451).

The spelling of 123111020130 in words is "one hundred twenty-three billion, one hundred eleven million, twenty thousand, one hundred thirty".