100421432021 has 2 divisors, whose sum is σ = 100421432022. Its totient is φ = 100421432020.

The previous prime is 100421431967. The next prime is 100421432039. The reversal of 100421432021 is 120234124001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97210509796 + 3210922225 = 311786^2 + 56665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100421432021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100421431984 and 100421432002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100421431021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210716010 + 50210716011.

It is an arithmetic number, because the mean of its divisors is an integer number (50210716011).

Almost surely, 2^100421432021 is an apocalyptic number.

It is an amenable number.

100421432021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100421432021 is an equidigital number, since it uses as much as digits as its factorization.

100421432021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 100421432021 its reverse (120234124001), we get a palindrome (220655556022).

The spelling of 100421432021 in words is "one hundred billion, four hundred twenty-one million, four hundred thirty-two thousand, twenty-one".