1242205124355 has 48 divisors (see below), whose sum is σ = 2362533578496. Its totient is φ = 600008497920.

The previous prime is 1242205124351. The next prime is 1242205124359. The reversal of 1242205124355 is 5534215022421.

1242205124355 is a `hidden beast` number, since 1 + 2 + 4 + 2 + 205 + 12 + 435 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1242205124351) and next prime (1242205124359).

It is not a de Polignac number, because 1242205124355 - 2² = 1242205124351 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242205124351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20001331 + ... + 20063340.

It is an arithmetic number, because the mean of its divisors is an integer number (49219449552).

Almost surely, 2^{1242205124355} is an apocalyptic number.

1242205124355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1242205124355 is a deficient number, since it is larger than the sum of its proper divisors (1120328454141).

1242205124355 is a wasteful number, since it uses less digits than its factorization.

1242205124355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40064748 (or 40064745 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 1242205124355 in words is "one trillion, two hundred forty-two billion, two hundred five million, one hundred twenty-four thousand, three hundred fifty-five".