1211133213091 has 2 divisors, whose sum is σ = 1211133213092. Its totient is φ = 1211133213090.

The previous prime is 1211133213083. The next prime is 1211133213167. The reversal of 1211133213091 is 1903123311121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211133213091 - 2³ = 1211133213083 is a prime.

It is a super-2 number, since 2×1211133213091² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211133219091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605566606545 + 605566606546.

It is an arithmetic number, because the mean of its divisors is an integer number (605566606546).

Almost surely, 2^{1211133213091} is an apocalyptic number.

1211133213091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211133213091 is an equidigital number, since it uses as much as digits as its factorization.

1211133213091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 1211133213091 in words is "one trillion, two hundred eleven billion, one hundred thirty-three million, two hundred thirteen thousand, ninety-one".