1242111220400 has 60 divisors (see below), whose sum is σ = 2990908914072. Its totient is φ = 495722872320.

The previous prime is 1242111220253. The next prime is 1242111220423. The reversal of 1242111220400 is 40221112421.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3327629 + ... + 3682028.

Almost surely, 2^{1242111220400} is an apocalyptic number.

1242111220400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242111220400 is an abundant number, since it is smaller than the sum of its proper divisors (1748797693672).

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

1242111220400 is a wasteful number, since it uses less digits than its factorization.

1242111220400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010118 (or 7010107 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1242111220400 its reverse (40221112421), we get a palindrome (1282332332821).

The spelling of 1242111220400 in words is "one trillion, two hundred forty-two billion, one hundred eleven million, two hundred twenty thousand, four hundred".