11220521 has 8 divisors (see below), whose sum is σ = 12230400. Its totient is φ = 10231632.

The previous prime is 11220491. The next prime is 11220533. The reversal of 11220521 is 12502211.

11220521 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 sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11220521 - 2⁶ = 11220457 is a prime.

It is a super-2 number, since 2×11220521² = 251800183022882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11220496 and 11220505.

It is not an unprimeable number, because it can be changed into a prime (11220541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4121 + ... + 6278.

It is an arithmetic number, because the mean of its divisors is an integer number (1528800).

Almost surely, 2^11220521 is an apocalyptic number.

It is an amenable number.

11220521 is a deficient number, since it is larger than the sum of its proper divisors (1009879).

11220521 is a wasteful number, since it uses less digits than its factorization.

11220521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10495.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 11220521 is about 3349.7046138428. The cubic root of 11220521 is about 223.8743515676.

Adding to 11220521 its reverse (12502211), we get a palindrome (23722732).

The spelling of 11220521 in words is "eleven million, two hundred twenty thousand, five hundred twenty-one".