10521491 has 4 divisors (see below), whose sum is σ = 10639800. Its totient is φ = 10403184.

The previous prime is 10521451. The next prime is 10521499. The reversal of 10521491 is 19412501.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 10521491 - 2¹⁴ = 10505107 is a prime.

It is a super-2 number, since 2×10521491² = 221403545726162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10521499) 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, 59021 + ... + 59198.

It is an arithmetic number, because the mean of its divisors is an integer number (2659950).

Almost surely, 2^10521491 is an apocalyptic number.

10521491 is a deficient number, since it is larger than the sum of its proper divisors (118309).

10521491 is an equidigital number, since it uses as much as digits as its factorization.

10521491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118308.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 10521491 is about 3243.6847873984. The cubic root of 10521491 is about 219.1252523989.

Adding to 10521491 its reverse (19412501), we get a palindrome (29933992).

The spelling of 10521491 in words is "ten million, five hundred twenty-one thousand, four hundred ninety-one".