11621021 has 4 divisors (see below), whose sum is σ = 11641212. Its totient is φ = 11600832.

The previous prime is 11621017. The next prime is 11621023. The reversal of 11621021 is 12012611.

11621021 = 2410² + 2411².

11621021 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5808100 + 5812921 = 2410^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 11621021 - 2² = 11621017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11620987 and 11621005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9206 + ... + 10391.

It is an arithmetic number, because the mean of its divisors is an integer number (2910303).

Almost surely, 2^11621021 is an apocalyptic number.

11621021 is the 2411-st centered square number.

It is an amenable number.

11621021 is a deficient number, since it is larger than the sum of its proper divisors (20191).

11621021 is an equidigital number, since it uses as much as digits as its factorization.

11621021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20190.

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

The square root of 11621021 is about 3408.9618654365. The cubic root of 11621021 is about 226.5068960113.

Adding to 11621021 its reverse (12012611), we get a palindrome (23633632).

The spelling of 11621021 in words is "eleven million, six hundred twenty-one thousand, twenty-one".