101320021 has 4 divisors (see below), whose sum is σ = 110530944. Its totient is φ = 92109100.

The previous prime is 101320001. The next prime is 101320031. The reversal of 101320021 is 120023101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 101320021 - 2¹³ = 101311829 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 (101320001) 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, 4605445 + ... + 4605466.

It is an arithmetic number, because the mean of its divisors is an integer number (27632736).

Almost surely, 2^101320021 is an apocalyptic number.

101320021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101320021 is a deficient number, since it is larger than the sum of its proper divisors (9210923).

101320021 is an equidigital number, since it uses as much as digits as its factorization.

101320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210922.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 101320021 is about 10065.7846688671. The cubic root of 101320021 is about 466.1922938642.

Adding to 101320021 its reverse (120023101), we get a palindrome (221343122).

The spelling of 101320021 in words is "one hundred one million, three hundred twenty thousand, twenty-one".