10921091 has 4 divisors (see below), whose sum is σ = 10999800. Its totient is φ = 10842384.

The previous prime is 10921087. The next prime is 10921103. The reversal of 10921091 is 19012901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19012901 = 19 ⋅1000679.

It is a cyclic number.

It is not a de Polignac number, because 10921091 - 2² = 10921087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10921051) 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, 39146 + ... + 39423.

It is an arithmetic number, because the mean of its divisors is an integer number (2749950).

Almost surely, 2^10921091 is an apocalyptic number.

10921091 is a deficient number, since it is larger than the sum of its proper divisors (78709).

10921091 is an equidigital number, since it uses as much as digits as its factorization.

10921091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78708.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 10921091 is about 3304.7074000583. The cubic root of 10921091 is about 221.8649382728.

Adding to 10921091 its reverse (19012901), we get a palindrome (29933992).

The spelling of 10921091 in words is "ten million, nine hundred twenty-one thousand, ninety-one".