101010110021 has 4 divisors (see below), whose sum is σ = 101736801600. Its totient is φ = 100283418444.

The previous prime is 101010110011. The next prime is 101010110041. The reversal of 101010110021 is 120011010101.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120011010101 = 167 ⋅718628803.

It is a cyclic number.

It is not a de Polignac number, because 101010110021 - 2²⁶ = 100943001157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101010109990 and 101010110008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101010110011) 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, 363345581 + ... + 363345858.

It is an arithmetic number, because the mean of its divisors is an integer number (25434200400).

Almost surely, 2^101010110021 is an apocalyptic number.

It is an amenable number.

101010110021 is a deficient number, since it is larger than the sum of its proper divisors (726691579).

101010110021 is an equidigital number, since it uses as much as digits as its factorization.

101010110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726691578.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 101010110021 its reverse (120011010101), we get a palindrome (221021120122).

The spelling of 101010110021 in words is "one hundred one billion, ten million, one hundred ten thousand, twenty-one".