1211506455042 has 64 divisors (see below), whose sum is σ = 2961019676160. Its totient is φ = 364839904512.

The previous prime is 1211506455041. The next prime is 1211506455083. The reversal of 1211506455042 is 2405546051121.

1211506455042 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 5 + 0 + 64 + 550 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1211506454988 and 1211506455006.

It is not an unprimeable number, because it can be changed into a prime (1211506455041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18326503 + ... + 18392490.

It is an arithmetic number, because the mean of its divisors is an integer number (46265932440).

Almost surely, 2^{1211506455042} is an apocalyptic number.

1211506455042 is an abundant number, since it is smaller than the sum of its proper divisors (1749513221118).

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

1211506455042 is a wasteful number, since it uses less digits than its factorization.

1211506455042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36719064 (or 36719058 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 1211506455042 in words is "one trillion, two hundred eleven billion, five hundred six million, four hundred fifty-five thousand, forty-two".