1040100421 has 4 divisors (see below), whose sum is σ = 1040165344. Its totient is φ = 1040035500.

The previous prime is 1040100419. The next prime is 1040100427. The reversal of 1040100421 is 1240010401.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1240010401 = 7 ⋅177144343.

It is a cyclic number.

It is not a de Polignac number, because 1040100421 - 2¹ = 1040100419 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 (1040100427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10696 + ... + 46846.

It is an arithmetic number, because the mean of its divisors is an integer number (260041336).

Almost surely, 2^1040100421 is an apocalyptic number.

It is an amenable number.

1040100421 is a deficient number, since it is larger than the sum of its proper divisors (64923).

1040100421 is an equidigital number, since it uses as much as digits as its factorization.

1040100421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64922.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1040100421 is about 32250.5879171218. The cubic root of 1040100421 is about 1013.1920125400.

Adding to 1040100421 its reverse (1240010401), we get a palindrome (2280110822).

The spelling of 1040100421 in words is "one billion, forty million, one hundred thousand, four hundred twenty-one".