101809421 has 8 divisors (see below), whose sum is σ = 116531904. Its totient is φ = 87131520.

The previous prime is 101809387. The next prime is 101809439. The reversal of 101809421 is 124908101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-101809421 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 (101809441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6095 + ... + 15516.

It is an arithmetic number, because the mean of its divisors is an integer number (14566488).

Almost surely, 2^101809421 is an apocalyptic number.

It is an amenable number.

101809421 is a deficient number, since it is larger than the sum of its proper divisors (14722483).

101809421 is an equidigital number, since it uses as much as digits as its factorization.

101809421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22291.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 101809421 is about 10090.0654606400. The cubic root of 101809421 is about 466.9416954204.

The spelling of 101809421 in words is "one hundred one million, eight hundred nine thousand, four hundred twenty-one".