10521557 has 4 divisors (see below), whose sum is σ = 10979040. Its totient is φ = 10064076.

The previous prime is 10521503. The next prime is 10521559. The reversal of 10521557 is 75512501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10521557 - 2¹² = 10517461 is a prime.

It is a super-2 number, since 2×10521557² = 221406323408498, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10521559) 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, 228707 + ... + 228752.

It is an arithmetic number, because the mean of its divisors is an integer number (2744760).

Almost surely, 2^10521557 is an apocalyptic number.

It is an amenable number.

10521557 is a deficient number, since it is larger than the sum of its proper divisors (457483).

10521557 is an equidigital number, since it uses as much as digits as its factorization.

10521557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457482.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 10521557 is about 3243.6949609974. The cubic root of 10521557 is about 219.1257105797.

The spelling of 10521557 in words is "ten million, five hundred twenty-one thousand, five hundred fifty-seven".