101223721 has 3 divisors (see below), whose sum is σ = 101233783. Its totient is φ = 101213660.

The previous prime is 101223719. The next prime is 101223737. The reversal of 101223721 is 127322101.

The square root of 101223721 is 10061.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127322101 = 757 ⋅168193.

It can be written as a sum of positive squares in only one way, i.e., 57927321 + 43296400 = 7611^2 + 6580^2 .

It is not a de Polignac number, because 101223721 - 2¹ = 101223719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101223761) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5031 + ... + 15091.

Almost surely, 2^101223721 is an apocalyptic number.

101223721 is the 10061-st square number.

101223721 is the 5031-st centered octagonal number.

It is an amenable number.

101223721 is a deficient number, since it is larger than the sum of its proper divisors (10062).

101223721 is an frugal number, since it uses more digits than its factorization.

101223721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20122 (or 10061 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The cubic root of 101223721 is about 466.0445489655.

Adding to 101223721 its reverse (127322101), we get a palindrome (228545822).

The spelling of 101223721 in words is "one hundred one million, two hundred twenty-three thousand, seven hundred twenty-one".