101721828 has 24 divisors (see below), whose sum is σ = 255609088. Its totient is φ = 31298976.

The previous prime is 101721799. The next prime is 101721857. The reversal of 101721828 is 828127101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (101721799) and next prime (101721857).

It is a junction number, because it is equal to n+sod(n) for n = 101721795 and 101721804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325876 + ... + 326187.

Almost surely, 2^101721828 is an apocalyptic number.

It is an amenable number.

101721828 is an abundant number, since it is smaller than the sum of its proper divisors (153887260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101721828 is a wasteful number, since it uses less digits than its factorization.

101721828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652083 (or 652081 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 101721828 is about 10085.7239700480. The cubic root of 101721828 is about 466.8077439681.

Adding to 101721828 its reverse (828127101), we get a palindrome (929848929).

The spelling of 101721828 in words is "one hundred one million, seven hundred twenty-one thousand, eight hundred twenty-eight".