101821730 has 8 divisors (see below), whose sum is σ = 183279132. Its totient is φ = 40728688.

The previous prime is 101821723. The next prime is 101821793. The reversal of 101821730 is 37128101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 97160449 + 4661281 = 9857^2 + 2159^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 101821696 and 101821705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5091077 + ... + 5091096.

Almost surely, 2^101821730 is an apocalyptic number.

101821730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101821730 is a deficient number, since it is larger than the sum of its proper divisors (81457402).

101821730 is a wasteful number, since it uses less digits than its factorization.

101821730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10182180.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 101821730 is about 10090.6753986044. The cubic root of 101821730 is about 466.9605127808.

Adding to 101821730 its reverse (37128101), we get a palindrome (138949831).

The spelling of 101821730 in words is "one hundred one million, eight hundred twenty-one thousand, seven hundred thirty".