101440421 has 4 divisors (see below), whose sum is σ = 104182092. Its totient is φ = 98698752.

The previous prime is 101440403. The next prime is 101440457. The reversal of 101440421 is 124044101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124044101 = 563 ⋅220327.

It can be written as a sum of positive squares in 2 ways, for example, as 76300225 + 25140196 = 8735^2 + 5014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101440421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101440421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101440021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370780 + ... + 1370853.

It is an arithmetic number, because the mean of its divisors is an integer number (26045523).

Almost surely, 2^101440421 is an apocalyptic number.

It is an amenable number.

101440421 is a deficient number, since it is larger than the sum of its proper divisors (2741671).

101440421 is an equidigital number, since it uses as much as digits as its factorization.

101440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2741670.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 101440421 is about 10071.7635496471. The cubic root of 101440421 is about 466.3768817114.

Adding to 101440421 its reverse (124044101), we get a palindrome (225484522).

The spelling of 101440421 in words is "one hundred one million, four hundred forty thousand, four hundred twenty-one".