1211011320195 has 72 divisors (see below), whose sum is σ = 2220393208176. Its totient is φ = 610494558336.

The previous prime is 1211011320149. The next prime is 1211011320199. The reversal of 1211011320195 is 5910231101121.

It is a happy number.

It is not a de Polignac number, because 1211011320195 - 2⁸ = 1211011319939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211011320199) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7112397 + ... + 7280673.

It is an arithmetic number, because the mean of its divisors is an integer number (30838794558).

Almost surely, 2^{1211011320195} is an apocalyptic number.

1211011320195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211011320195 is a deficient number, since it is larger than the sum of its proper divisors (1009381887981).

1211011320195 is a wasteful number, since it uses less digits than its factorization.

1211011320195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168769 (or 168747 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 27.

The spelling of 1211011320195 in words is "one trillion, two hundred eleven billion, eleven million, three hundred twenty thousand, one hundred ninety-five".