101521663 has 4 divisors (see below), whose sum is σ = 105022440. Its totient is φ = 98020888.

The previous prime is 101521649. The next prime is 101521669. The reversal of 101521663 is 366125101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101521663 - 2⁵ = 101521631 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 (101521669) 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, 1750345 + ... + 1750402.

It is an arithmetic number, because the mean of its divisors is an integer number (26255610).

Almost surely, 2^101521663 is an apocalyptic number.

101521663 is a deficient number, since it is larger than the sum of its proper divisors (3500777).

101521663 is an equidigital number, since it uses as much as digits as its factorization.

101521663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500776.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 101521663 is about 10075.7958990841. The cubic root of 101521663 is about 466.5013530670.

Adding to 101521663 its reverse (366125101), we get a palindrome (467646764).

The spelling of 101521663 in words is "one hundred one million, five hundred twenty-one thousand, six hundred sixty-three".