1211555051442 has 24 divisors (see below), whose sum is σ = 2649568995216. Its totient is φ = 400077368376.

The previous prime is 1211555051429. The next prime is 1211555051459. The reversal of 1211555051442 is 2441505551121.

1211555051442 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 5 + 5 + 505 + 144 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1211555051397 and 1211555051406.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314524308 + ... + 314528159.

It is an arithmetic number, because the mean of its divisors is an integer number (110398708134).

Almost surely, 2^{1211555051442} is an apocalyptic number.

1211555051442 is an abundant number, since it is smaller than the sum of its proper divisors (1438013943774).

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

1211555051442 is a wasteful number, since it uses less digits than its factorization.

1211555051442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629052582 (or 629052579 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

The spelling of 1211555051442 in words is "one trillion, two hundred eleven billion, five hundred fifty-five million, fifty-one thousand, four hundred forty-two".