1211255550042 has 32 divisors (see below), whose sum is σ = 2440583825472. Its totient is φ = 400750664064.

The previous prime is 1211255550023. The next prime is 1211255550047. The reversal of 1211255550042 is 2400555521121.

It is a junction number, because it is equal to n+sod(n) for n = 1211255549985 and 1211255550012.

It is not an unprimeable number, because it can be changed into a prime (1211255550047) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 923428 + ... + 1809759.

It is an arithmetic number, because the mean of its divisors is an integer number (76268244546).

Almost surely, 2^{1211255550042} is an apocalyptic number.

1211255550042 is an abundant number, since it is smaller than the sum of its proper divisors (1229328275430).

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

1211255550042 is a wasteful number, since it uses less digits than its factorization.

1211255550042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733742.

The product of its (nonzero) digits is 20000, while the sum is 33.

The spelling of 1211255550042 in words is "one trillion, two hundred eleven billion, two hundred fifty-five million, five hundred fifty thousand, forty-two".