11620921 has 4 divisors (see below), whose sum is σ = 12514852. Its totient is φ = 10726992.

The previous prime is 11620919. The next prime is 11620933. The reversal of 11620921 is 12902611.

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 2134521 + 9486400 = 1461^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 11620921 - 2¹ = 11620919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11620892 and 11620901.

It is not an unprimeable number, because it can be changed into a prime (11620901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446946 + ... + 446971.

It is an arithmetic number, because the mean of its divisors is an integer number (3128713).

Almost surely, 2^11620921 is an apocalyptic number.

It is an amenable number.

11620921 is a deficient number, since it is larger than the sum of its proper divisors (893931).

11620921 is an equidigital number, since it uses as much as digits as its factorization.

11620921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893930.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 11620921 is about 3408.9471981830. The cubic root of 11620921 is about 226.5062463049.

The spelling of 11620921 in words is "eleven million, six hundred twenty thousand, nine hundred twenty-one".