11211123021 has 24 divisors (see below), whose sum is σ = 17988297120. Its totient is φ = 6185444832.

The previous prime is 11211123017. The next prime is 11211123029. The reversal of 11211123021 is 12032111211.

It is not a de Polignac number, because 11211123021 - 2² = 11211123017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211123029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1310671 + ... + 1319196.

It is an arithmetic number, because the mean of its divisors is an integer number (749512380).

Almost surely, 2^11211123021 is an apocalyptic number.

It is an amenable number.

11211123021 is a deficient number, since it is larger than the sum of its proper divisors (6777174099).

11211123021 is a wasteful number, since it uses less digits than its factorization.

11211123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629913 (or 2629906 counting only the distinct ones).

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

Adding to 11211123021 its reverse (12032111211), we get a palindrome (23243234232).

The spelling of 11211123021 in words is "eleven billion, two hundred eleven million, one hundred twenty-three thousand, twenty-one".