100421124521 has 2 divisors, whose sum is σ = 100421124522. Its totient is φ = 100421124520.

The previous prime is 100421124509. The next prime is 100421124569. The reversal of 100421124521 is 125421124001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71022250000 + 29398874521 = 266500^2 + 171461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100421124521 is a prime.

It is not a weakly prime, because it can be changed into another prime (100421124121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210562260 + 50210562261.

It is an arithmetic number, because the mean of its divisors is an integer number (50210562261).

Almost surely, 2^100421124521 is an apocalyptic number.

It is an amenable number.

100421124521 is a deficient number, since it is larger than the sum of its proper divisors (1).

100421124521 is an equidigital number, since it uses as much as digits as its factorization.

100421124521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 100421124521 its reverse (125421124001), we get a palindrome (225842248522).

The spelling of 100421124521 in words is "one hundred billion, four hundred twenty-one million, one hundred twenty-four thousand, five hundred twenty-one".