10521240 has 64 divisors (see below), whose sum is σ = 32313600. Its totient is φ = 2739072.

The previous prime is 10521239. The next prime is 10521241. The reversal of 10521240 is 4212501.

It is an interprime number because it is at equal distance from previous prime (10521239) and next prime (10521241).

It is a super-2 number, since 2×10521240² = 221392982275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 (10521241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4141 + ... + 6179.

It is an arithmetic number, because the mean of its divisors is an integer number (504900).

Almost surely, 2^10521240 is an apocalyptic number.

10521240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10521240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16156800).

10521240 is an abundant number, since it is smaller than the sum of its proper divisors (21792360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10521240 is a wasteful number, since it uses less digits than its factorization.

10521240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096 (or 2092 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 10521240 is about 3243.6460966018. The cubic root of 10521240 is about 219.1235099058.

Adding to 10521240 its reverse (4212501), we get a palindrome (14733741).

The spelling of 10521240 in words is "ten million, five hundred twenty-one thousand, two hundred forty".