101020010021 has 4 divisors (see below), whose sum is σ = 115451440032. Its totient is φ = 86588580012.

The previous prime is 101020009991. The next prime is 101020010023. The reversal of 101020010021 is 120010020101.

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 101020010021 - 2¹⁰ = 101020008997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101020009990 and 101020010008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101020010023) 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, 7215714995 + ... + 7215715008.

It is an arithmetic number, because the mean of its divisors is an integer number (28862860008).

Almost surely, 2^101020010021 is an apocalyptic number.

It is an amenable number.

101020010021 is a deficient number, since it is larger than the sum of its proper divisors (14431430011).

101020010021 is an equidigital number, since it uses as much as digits as its factorization.

101020010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14431430010.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 101020010021 its reverse (120010020101), we get a palindrome (221030030122).

The spelling of 101020010021 in words is "one hundred one billion, twenty million, ten thousand, twenty-one".