11031212021 has 8 divisors (see below), whose sum is σ = 11153955000. Its totient is φ = 10908734400.

The previous prime is 11031212011. The next prime is 11031212039. The reversal of 11031212021 is 12021213011.

It can be written as a sum of positive squares in 4 ways, for example, as 3654807025 + 7376404996 = 60455^2 + 85886^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11031212021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11031211987 and 11031212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11031212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17855 + ... + 149603.

It is an arithmetic number, because the mean of its divisors is an integer number (1394244375).

Almost surely, 2^11031212021 is an apocalyptic number.

It is an amenable number.

11031212021 is a deficient number, since it is larger than the sum of its proper divisors (122742979).

11031212021 is a wasteful number, since it uses less digits than its factorization.

11031212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132679.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 11031212021 its reverse (12021213011), we get a palindrome (23052425032).

The spelling of 11031212021 in words is "eleven billion, thirty-one million, two hundred twelve thousand, twenty-one".