1211011111988 has 24 divisors (see below), whose sum is σ = 2296116833472. Its totient is φ = 556634381184.

The previous prime is 1211011111967. The next prime is 1211011111991. The reversal of 1211011111988 is 8891111101121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207078320 + ... + 207084167.

It is an arithmetic number, because the mean of its divisors is an integer number (95671534728).

Almost surely, 2^{1211011111988} is an apocalyptic number.

It is an amenable number.

1211011111988 is a deficient number, since it is larger than the sum of its proper divisors (1085105721484).

1211011111988 is a wasteful number, since it uses less digits than its factorization.

1211011111988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414162551 (or 414162549 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 35.

The spelling of 1211011111988 in words is "one trillion, two hundred eleven billion, eleven million, one hundred eleven thousand, nine hundred eighty-eight".