10100421 has 6 divisors (see below), whose sum is σ = 14589510. Its totient is φ = 6733608.

The previous prime is 10100407. The next prime is 10100423. The reversal of 10100421 is 12400101.

It is a happy number.

10100421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9235521 + 864900 = 3039^2 + 930^2 .

It is not a de Polignac number, because 10100421 - 2¹⁸ = 9838277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1122269 = 10100421 / (1 + 0 + 1 + 0 + 0 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10100423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561126 + ... + 561143.

It is an arithmetic number, because the mean of its divisors is an integer number (2431585).

Almost surely, 2^10100421 is an apocalyptic number.

It is an amenable number.

10100421 is a deficient number, since it is larger than the sum of its proper divisors (4489089).

10100421 is a wasteful number, since it uses less digits than its factorization.

10100421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122275 (or 1122272 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 10100421 is about 3178.1159513146. The cubic root of 10100421 is about 216.1622366533.

Adding to 10100421 its reverse (12400101), we get a palindrome (22500522).

It can be divided in two parts, 101004 and 21, that added together give a triangular number (101025 = T₄₄₉).

The spelling of 10100421 in words is "ten million, one hundred thousand, four hundred twenty-one".