10521399 has 8 divisors (see below), whose sum is σ = 16032640. Its totient is φ = 6012216.

The previous prime is 10521377. The next prime is 10521437. The reversal of 10521399 is 99312501.

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

It is not a de Polignac number, because 10521399 - 2¹¹ = 10519351 is a prime.

It is a super-2 number, since 2×10521399² = 221399673834402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10521359) 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 7 ways as a sum of consecutive naturals, for example, 250489 + ... + 250530.

It is an arithmetic number, because the mean of its divisors is an integer number (2004080).

Almost surely, 2^10521399 is an apocalyptic number.

10521399 is a deficient number, since it is larger than the sum of its proper divisors (5511241).

10521399 is an equidigital number, since it uses as much as digits as its factorization.

10521399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501029.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 10521399 is about 3243.6706059648. The cubic root of 10521399 is about 219.1246137194.

The spelling of 10521399 in words is "ten million, five hundred twenty-one thousand, three hundred ninety-nine".