20101101120021 has 4 divisors (see below), whose sum is σ = 26801468160032. Its totient is φ = 13400734080012.

The previous prime is 20101101120019. The next prime is 20101101120043. The reversal of 20101101120021 is 12002110110102.

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 20101101120021 - 2¹ = 20101101120019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101101119979 and 20101101120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101101121021) 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, 3350183520001 + ... + 3350183520006.

It is an arithmetic number, because the mean of its divisors is an integer number (6700367040008).

Almost surely, 2^{20101101120021} is an apocalyptic number.

It is an amenable number.

20101101120021 is a deficient number, since it is larger than the sum of its proper divisors (6700367040011).

20101101120021 is an equidigital number, since it uses as much as digits as its factorization.

20101101120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700367040010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20101101120021 its reverse (12002110110102), we get a palindrome (32103211230123).

The spelling of 20101101120021 in words is "twenty trillion, one hundred one billion, one hundred one million, one hundred twenty thousand, twenty-one".