100443021 has 16 divisors (see below), whose sum is σ = 162059904. Its totient is φ = 54019584.

The previous prime is 100442977. The next prime is 100443043. The reversal of 100443021 is 120344001.

It is not a de Polignac number, because 100443021 - 2¹⁰ = 100441997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100443121) 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, 140320 + ... + 141033.

It is an arithmetic number, because the mean of its divisors is an integer number (10128744).

Almost surely, 2^100443021 is an apocalyptic number.

It is an amenable number.

100443021 is a deficient number, since it is larger than the sum of its proper divisors (61616883).

100443021 is a wasteful number, since it uses less digits than its factorization.

100443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281380.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 100443021 is about 10022.1265707434. The cubic root of 100443021 is about 464.8433140724.

Adding to 100443021 its reverse (120344001), we get a palindrome (220787022).

The spelling of 100443021 in words is "one hundred million, four hundred forty-three thousand, twenty-one".