100203440421 has 32 divisors (see below), whose sum is σ = 158216970240. Its totient is φ = 55193374656.

The previous prime is 100203440413. The next prime is 100203440431. The reversal of 100203440421 is 124044302001.

It is not a de Polignac number, because 100203440421 - 2³ = 100203440413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100203440431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234130 + ... + 505196.

It is an arithmetic number, because the mean of its divisors is an integer number (4944280320).

Almost surely, 2^100203440421 is an apocalyptic number.

It is an amenable number.

100203440421 is a deficient number, since it is larger than the sum of its proper divisors (58013529819).

100203440421 is a wasteful number, since it uses less digits than its factorization.

100203440421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271713.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 100203440421 its reverse (124044302001), we get a palindrome (224247742422).

The spelling of 100203440421 in words is "one hundred billion, two hundred three million, four hundred forty thousand, four hundred twenty-one".