1211132011309 has 4 divisors (see below), whose sum is σ = 1321234921440. Its totient is φ = 1101029101180.

The previous prime is 1211132011301. The next prime is 1211132011319. The reversal of 1211132011309 is 9031102311121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211132011309 - 2³ = 1211132011301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211132011301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55051455049 + ... + 55051455070.

It is an arithmetic number, because the mean of its divisors is an integer number (330308730360).

Almost surely, 2^{1211132011309} is an apocalyptic number.

It is an amenable number.

1211132011309 is a deficient number, since it is larger than the sum of its proper divisors (110102910131).

1211132011309 is a wasteful number, since it uses less digits than its factorization.

1211132011309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110102910130.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 1211132011309 in words is "one trillion, two hundred eleven billion, one hundred thirty-two million, eleven thousand, three hundred nine".