1212430120400 has 120 divisors (see below), whose sum is σ = 3069218274720. Its totient is φ = 458990737920.

The previous prime is 1212430120379. The next prime is 1212430120411. The reversal of 1212430120400 is 40210342121.

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 23 ways as a sum of consecutive naturals, for example, 7620059 + ... + 7777541.

It is an arithmetic number, because the mean of its divisors is an integer number (25576818956).

Almost surely, 2^{1212430120400} is an apocalyptic number.

1212430120400 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 1212430120400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1534609137360).

1212430120400 is an abundant number, since it is smaller than the sum of its proper divisors (1856788154320).

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

1212430120400 is a wasteful number, since it uses less digits than its factorization.

1212430120400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158533 (or 158522 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1212430120400 its reverse (40210342121), we get a palindrome (1252640462521).

The spelling of 1212430120400 in words is "one trillion, two hundred twelve billion, four hundred thirty million, one hundred twenty thousand, four hundred".