10521378 has 72 divisors (see below), whose sum is σ = 27031680. Its totient is φ = 2948400.

The previous prime is 10521377. The next prime is 10521437. The reversal of 10521378 is 87312501.

It is a super-2 number, since 2×10521378² = 221398790037768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10521377) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 69603 + ... + 69753.

It is an arithmetic number, because the mean of its divisors is an integer number (375440).

Almost surely, 2^10521378 is an apocalyptic number.

10521378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 10521378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13515840).

10521378 is an abundant number, since it is smaller than the sum of its proper divisors (16510302).

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

10521378 is a wasteful number, since it uses less digits than its factorization.

10521378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 10521378 is about 3243.6673688897. The cubic root of 10521378 is about 219.1244679333.

Adding to 10521378 its reverse (87312501), we get a palindrome (97833879).

The spelling of 10521378 in words is "ten million, five hundred twenty-one thousand, three hundred seventy-eight".