11312021213 has 8 divisors (see below), whose sum is σ = 11703569880. Its totient is φ = 10920571200.

The previous prime is 11312021183. The next prime is 11312021243. The reversal of 11312021213 is 31212021311.

It is an interprime number because it is at equal distance from previous prime (11312021183) and next prime (11312021243).

It can be written as a sum of positive squares in 4 ways, for example, as 5980392889 + 5331628324 = 77333^2 + 73018^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11312021213 - 2¹² = 11312017117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11312021191 and 11312021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312021243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267431 + ... + 306827.

It is an arithmetic number, because the mean of its divisors is an integer number (1462946235).

Almost surely, 2^11312021213 is an apocalyptic number.

It is an amenable number.

11312021213 is a deficient number, since it is larger than the sum of its proper divisors (391548667).

11312021213 is an equidigital number, since it uses as much as digits as its factorization.

11312021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49327.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11312021213 its reverse (31212021311), we get a palindrome (42524042524).

The spelling of 11312021213 in words is "eleven billion, three hundred twelve million, twenty-one thousand, two hundred thirteen".