101721330 has 24 divisors (see below), whose sum is σ = 264475692. Its totient is φ = 27125664.

The previous prime is 101721329. The next prime is 101721337. The reversal of 101721330 is 33127101.

It can be written as a sum of positive squares in 2 ways, for example, as 98069409 + 3651921 = 9903^2 + 1911^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (101721337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 565029 + ... + 565208.

Almost surely, 2^101721330 is an apocalyptic number.

101721330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101721330 is an abundant number, since it is smaller than the sum of its proper divisors (162754362).

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

101721330 is a wasteful number, since it uses less digits than its factorization.

101721330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130250 (or 1130247 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 101721330 is about 10085.6992816562. The cubic root of 101721330 is about 466.8069821827.

Adding to 101721330 its reverse (33127101), we get a palindrome (134848431).

The spelling of 101721330 in words is "one hundred one million, seven hundred twenty-one thousand, three hundred thirty".