11211321021 has 16 divisors (see below), whose sum is σ = 15039595200. Its totient is φ = 7428769920.

The previous prime is 11211321001. The next prime is 11211321047. The reversal of 11211321021 is 12012311211.

It is not a de Polignac number, because 11211321021 - 2⁷ = 11211320893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211321001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310606 + ... + 344816.

It is an arithmetic number, because the mean of its divisors is an integer number (939974700).

Almost surely, 2^11211321021 is an apocalyptic number.

It is an amenable number.

11211321021 is a deficient number, since it is larger than the sum of its proper divisors (3828274179).

11211321021 is a wasteful number, since it uses less digits than its factorization.

11211321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34876.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11211321021 its reverse (12012311211), we get a palindrome (23223632232).

The spelling of 11211321021 in words is "eleven billion, two hundred eleven million, three hundred twenty-one thousand, twenty-one".