101021220021 has 4 divisors (see below), whose sum is σ = 134694960032. Its totient is φ = 67347480012.

The previous prime is 101021219993. The next prime is 101021220037. The reversal of 101021220021 is 120022120101.

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 not a de Polignac number, because 101021220021 - 2¹³ = 101021211829 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 = 101021219979 and 101021220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101021220221) 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, 16836870001 + ... + 16836870006.

It is an arithmetic number, because the mean of its divisors is an integer number (33673740008).

Almost surely, 2^101021220021 is an apocalyptic number.

It is an amenable number.

101021220021 is a deficient number, since it is larger than the sum of its proper divisors (33673740011).

101021220021 is an equidigital number, since it uses as much as digits as its factorization.

101021220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33673740010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 101021220021 its reverse (120022120101), we get a palindrome (221043340122).

The spelling of 101021220021 in words is "one hundred one billion, twenty-one million, two hundred twenty thousand, twenty-one".