1212123310020 has 288 divisors, whose sum is σ = 4407424939008. Its totient is φ = 263832754176.

The previous prime is 1212123310019. The next prime is 1212123310031. The reversal of 1212123310020 is 200133212121.

1212123310020 is a `hidden beast` number, since 1 + 212 + 123 + 310 + 0 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1212123309975 and 1212123310002.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1914544 + ... + 2467736.

It is an arithmetic number, because the mean of its divisors is an integer number (15303558816).

Almost surely, 2^{1212123310020} is an apocalyptic number.

1212123310020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212123310020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203712469504).

1212123310020 is an abundant number, since it is smaller than the sum of its proper divisors (3195301628988).

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

1212123310020 is a wasteful number, since it uses less digits than its factorization.

1212123310020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553299 (or 553294 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1212123310020 its reverse (200133212121), we get a palindrome (1412256522141).

The spelling of 1212123310020 in words is "one trillion, two hundred twelve billion, one hundred twenty-three million, three hundred ten thousand, twenty".