11913021 has 32 divisors (see below), whose sum is σ = 18698240. Its totient is φ = 7484400.

The previous prime is 11913017. The next prime is 11913023. The reversal of 11913021 is 12031911.

It is not a de Polignac number, because 11913021 - 2² = 11913017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11912985 and 11913003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11913023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35826 + ... + 36156.

It is an arithmetic number, because the mean of its divisors is an integer number (584320).

Almost surely, 2^11913021 is an apocalyptic number.

It is an amenable number.

11913021 is a deficient number, since it is larger than the sum of its proper divisors (6785219).

11913021 is a wasteful number, since it uses less digits than its factorization.

11913021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 11913021 is about 3451.5244458065. The cubic root of 11913021 is about 228.3883616579.

Adding to 11913021 its reverse (12031911), we get a palindrome (23944932).

The spelling of 11913021 in words is "eleven million, nine hundred thirteen thousand, twenty-one".