100521240 has 32 divisors (see below), whose sum is σ = 301564080. Its totient is φ = 26805632.

The previous prime is 100521227. The next prime is 100521241. The reversal of 100521240 is 42125001.

It is a super-2 number, since 2×100521240² = 20209039382275200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100521241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418719 + ... + 418958.

Almost surely, 2^100521240 is an apocalyptic number.

100521240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100521240 is an abundant number, since it is smaller than the sum of its proper divisors (201042840).

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

100521240 is a wasteful number, since it uses less digits than its factorization.

100521240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837691 (or 837687 counting only the distinct ones).

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

The square root of 100521240 is about 10026.0281268307. The cubic root of 100521240 is about 464.9639467943.

Adding to 100521240 its reverse (42125001), we get a palindrome (142646241).

The spelling of 100521240 in words is "one hundred million, five hundred twenty-one thousand, two hundred forty".