11212001021 has 16 divisors (see below), whose sum is σ = 12167290800. Its totient is φ = 10270110720.

The previous prime is 11212000993. The next prime is 11212001089. The reversal of 11212001021 is 12010021211.

It can be written as a sum of positive squares in 8 ways, for example, as 6026416900 + 5185584121 = 77630^2 + 72011^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212001021 - 2¹⁸ = 11211738877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11212000993 and 11212001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212003021) 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 15 ways as a sum of consecutive naturals, for example, 2634131 + ... + 2638383.

It is an arithmetic number, because the mean of its divisors is an integer number (760455675).

Almost surely, 2^11212001021 is an apocalyptic number.

It is an amenable number.

11212001021 is a deficient number, since it is larger than the sum of its proper divisors (955289779).

11212001021 is a wasteful number, since it uses less digits than its factorization.

11212001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5776.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11212001021 its reverse (12010021211), we get a palindrome (23222022232).

The spelling of 11212001021 in words is "eleven billion, two hundred twelve million, one thousand, twenty-one".