20101112100021 has 4 divisors (see below), whose sum is σ = 26801482800032. Its totient is φ = 13400741400012.

The previous prime is 20101112100007. The next prime is 20101112100029. The reversal of 20101112100021 is 12000121110102.

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 20101112100021 - 2³⁵ = 20066752361653 is a prime.

It is a super-2 number, since 2×20101112100021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101112100029) 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, 3350185350001 + ... + 3350185350006.

It is an arithmetic number, because the mean of its divisors is an integer number (6700370700008).

Almost surely, 2^{20101112100021} is an apocalyptic number.

It is an amenable number.

20101112100021 is a deficient number, since it is larger than the sum of its proper divisors (6700370700011).

20101112100021 is an equidigital number, since it uses as much as digits as its factorization.

20101112100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700370700010.

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

Adding to 20101112100021 its reverse (12000121110102), we get a palindrome (32101233210123).

The spelling of 20101112100021 in words is "twenty trillion, one hundred one billion, one hundred twelve million, one hundred thousand, twenty-one".