11211230021 has 2 divisors, whose sum is σ = 11211230022. Its totient is φ = 11211230020.

The previous prime is 11211229987. The next prime is 11211230033. The reversal of 11211230021 is 12003211211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10433601025 + 777628996 = 102145^2 + 27886^2 .

It is an emirp because it is prime and its reverse (12003211211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11211230021 - 2³⁰ = 10137488197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211229978 and 11211230005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211230521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605615010 + 5605615011.

It is an arithmetic number, because the mean of its divisors is an integer number (5605615011).

Almost surely, 2^11211230021 is an apocalyptic number.

It is an amenable number.

11211230021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211230021 is an equidigital number, since it uses as much as digits as its factorization.

11211230021 is an evil number, because the sum of its binary digits is even.

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

Adding to 11211230021 its reverse (12003211211), we get a palindrome (23214441232).

The spelling of 11211230021 in words is "eleven billion, two hundred eleven million, two hundred thirty thousand, twenty-one".