11421024021 has 24 divisors (see below), whose sum is σ = 18138491904. Its totient is φ = 6867322560.

The previous prime is 11421024011. The next prime is 11421024037. The reversal of 11421024021 is 12042012411.

11421024021 is a `hidden beast` number, since 1 + 1 + 421 + 0 + 240 + 2 + 1 = 666.

It is not a de Polignac number, because 11421024021 - 2¹⁰ = 11421022997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11421023985 and 11421024003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421024011) 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, 441616 + ... + 466761.

It is an arithmetic number, because the mean of its divisors is an integer number (755770496).

Almost surely, 2^11421024021 is an apocalyptic number.

11421024021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11421024021 is a deficient number, since it is larger than the sum of its proper divisors (6717467883).

11421024021 is a wasteful number, since it uses less digits than its factorization.

11421024021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908521 (or 908518 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 11421024021 its reverse (12042012411), we get a palindrome (23463036432).

The spelling of 11421024021 in words is "eleven billion, four hundred twenty-one million, twenty-four thousand, twenty-one".