101312021 has 4 divisors (see below), whose sum is σ = 101672844. Its totient is φ = 100951200.

The previous prime is 101311997. The next prime is 101312023. The reversal of 101312021 is 120213101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120213101 = 89 ⋅1350709.

It can be written as a sum of positive squares in 2 ways, for example, as 35880100 + 65431921 = 5990^2 + 8089^2 .

It is a cyclic number.

It is not a de Polignac number, because 101312021 - 2¹⁰ = 101310997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101311993 and 101312011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101312023) 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, 179990 + ... + 180551.

It is an arithmetic number, because the mean of its divisors is an integer number (25418211).

Almost surely, 2^101312021 is an apocalyptic number.

It is an amenable number.

101312021 is a deficient number, since it is larger than the sum of its proper divisors (360823).

101312021 is an equidigital number, since it uses as much as digits as its factorization.

101312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360822.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 101312021 is about 10065.3872752120. The cubic root of 101312021 is about 466.1800237111.

Adding to 101312021 its reverse (120213101), we get a palindrome (221525122).

The spelling of 101312021 in words is "one hundred one million, three hundred twelve thousand, twenty-one".