100421401521 has 64 divisors (see below), whose sum is σ = 163220129280. Its totient is φ = 53694627840.

The previous prime is 100421401511. The next prime is 100421401541. The reversal of 100421401521 is 125104124001.

It is not a de Polignac number, because 100421401521 - 2¹⁴ = 100421385137 is a prime.

It is a super-2 number, since 2×100421401521² (a number of 23 digits) contains 22 as substring.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100421401511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5782311 + ... + 5799651.

It is an arithmetic number, because the mean of its divisors is an integer number (2550314520).

Almost surely, 2^100421401521 is an apocalyptic number.

It is an amenable number.

100421401521 is a deficient number, since it is larger than the sum of its proper divisors (62798727759).

100421401521 is a wasteful number, since it uses less digits than its factorization.

100421401521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17674.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 100421401521 its reverse (125104124001), we get a palindrome (225525525522).

The spelling of 100421401521 in words is "one hundred billion, four hundred twenty-one million, four hundred one thousand, five hundred twenty-one".