100421240 has 16 divisors (see below), whose sum is σ = 225947880. Its totient is φ = 40168480.

The previous prime is 100421239. The next prime is 100421249. The reversal of 100421240 is 42124001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100421249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255226 + ... + 1255305.

Almost surely, 2^100421240 is an apocalyptic number.

100421240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100421240 is an abundant number, since it is smaller than the sum of its proper divisors (125526640).

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

100421240 is a wasteful number, since it uses less digits than its factorization.

100421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510542 (or 2510538 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 100421240 is about 10021.0398662015. The cubic root of 100421240 is about 464.8097113258.

Adding to 100421240 its reverse (42124001), we get a palindrome (142545241).

The spelling of 100421240 in words is "one hundred million, four hundred twenty-one thousand, two hundred forty".