100331421 has 4 divisors (see below), whose sum is σ = 133775232. Its totient is φ = 66887612.

The previous prime is 100331411. The next prime is 100331423. The reversal of 100331421 is 124133001.

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 100331421 - 2⁵ = 100331389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100331421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100331423) 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, 16721901 + ... + 16721906.

It is an arithmetic number, because the mean of its divisors is an integer number (33443808).

Almost surely, 2^100331421 is an apocalyptic number.

It is an amenable number.

100331421 is a deficient number, since it is larger than the sum of its proper divisors (33443811).

100331421 is an equidigital number, since it uses as much as digits as its factorization.

100331421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33443810.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 100331421 is about 10016.5573427201. The cubic root of 100331421 is about 464.6710912601.

Adding to 100331421 its reverse (124133001), we get a palindrome (224464422).

The spelling of 100331421 in words is "one hundred million, three hundred thirty-one thousand, four hundred twenty-one".