20101112120021 has 4 divisors (see below), whose sum is σ = 20104538257152. Its totient is φ = 20097685982892.

The previous prime is 20101112119993. The next prime is 20101112120053. The reversal of 20101112120021 is 12002121110102.

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 a de Polignac number, because none of the positive numbers 2^k-20101112120021 is a prime.

It is a super-2 number, since 2×20101112120021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101112119978 and 20101112120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101112120081) 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, 1713059765 + ... + 1713071498.

It is an arithmetic number, because the mean of its divisors is an integer number (5026134564288).

Almost surely, 2^{20101112120021} is an apocalyptic number.

It is an amenable number.

20101112120021 is a deficient number, since it is larger than the sum of its proper divisors (3426137131).

20101112120021 is an equidigital number, since it uses as much as digits as its factorization.

20101112120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426137130.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20101112120021 its reverse (12002121110102), we get a palindrome (32103233230123).

The spelling of 20101112120021 in words is "twenty trillion, one hundred one billion, one hundred twelve million, one hundred twenty thousand, twenty-one".