11212031309 has 4 divisors (see below), whose sum is σ = 11802138240. Its totient is φ = 10621924380.

The previous prime is 11212031293. The next prime is 11212031323. The reversal of 11212031309 is 90313021211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90313021211 = 7 ⋅12901860173.

It is a cyclic number.

It is not a de Polignac number, because 11212031309 - 2⁴ = 11212031293 is a prime.

It is a super-3 number, since 3×11212031309³ (a number of 31 digits) contains 333 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 (11212031009) 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, 295053437 + ... + 295053474.

It is an arithmetic number, because the mean of its divisors is an integer number (2950534560).

Almost surely, 2^11212031309 is an apocalyptic number.

11212031309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11212031309 is a deficient number, since it is larger than the sum of its proper divisors (590106931).

11212031309 is an equidigital number, since it uses as much as digits as its factorization.

11212031309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590106930.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 11212031309 in words is "eleven billion, two hundred twelve million, thirty-one thousand, three hundred nine".