100405423421 has 4 divisors (see below), whose sum is σ = 102740433312. Its totient is φ = 98070413532.

The previous prime is 100405423399. The next prime is 100405423423. The reversal of 100405423421 is 124324504001.

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 100405423421 - 2¹⁸ = 100405161277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100405423423) 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, 1167504881 + ... + 1167504966.

It is an arithmetic number, because the mean of its divisors is an integer number (25685108328).

Almost surely, 2^100405423421 is an apocalyptic number.

It is an amenable number.

100405423421 is a deficient number, since it is larger than the sum of its proper divisors (2335009891).

100405423421 is an equidigital number, since it uses as much as digits as its factorization.

100405423421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335009890.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 100405423421 its reverse (124324504001), we get a palindrome (224729927422).

The spelling of 100405423421 in words is "one hundred billion, four hundred five million, four hundred twenty-three thousand, four hundred twenty-one".