11211011011999 has 4 divisors (see below), whose sum is σ = 11211183524920. Its totient is φ = 11210838499080.

The previous prime is 11211011011987. The next prime is 11211011012029. The reversal of 11211011011999 is 99911011011211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11211011011999 - 2¹³ = 11211011003807 is a prime.

It is a super-2 number, since 2×11211011011999² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211011011939) 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, 86158944 + ... + 86288965.

It is an arithmetic number, because the mean of its divisors is an integer number (2802795881230).

Almost surely, 2^{11211011011999} is an apocalyptic number.

11211011011999 is a deficient number, since it is larger than the sum of its proper divisors (172512921).

11211011011999 is an equidigital number, since it uses as much as digits as its factorization.

11211011011999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172512920.

The product of its (nonzero) digits is 1458, while the sum is 37.

The spelling of 11211011011999 in words is "eleven trillion, two hundred eleven billion, eleven million, eleven thousand, nine hundred ninety-nine".