20121333101 has 4 divisors (see below), whose sum is σ = 20376033600. Its totient is φ = 19866632604.

The previous prime is 20121333053. The next prime is 20121333107. The reversal of 20121333101 is 10133312102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10133312102 = 2 ⋅5066656051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121333101 is a prime.

It is a super-2 number, since 2×20121333101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121333101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121333107) 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, 127350131 + ... + 127350288.

It is an arithmetic number, because the mean of its divisors is an integer number (5094008400).

Almost surely, 2^20121333101 is an apocalyptic number.

It is an amenable number.

20121333101 is a deficient number, since it is larger than the sum of its proper divisors (254700499).

20121333101 is an equidigital number, since it uses as much as digits as its factorization.

20121333101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254700498.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20121333101 its reverse (10133312102), we get a palindrome (30254645203).

It can be divided in two parts, 20 and 121333101, that added together give a palindrome (121333121).

The spelling of 20121333101 in words is "twenty billion, one hundred twenty-one million, three hundred thirty-three thousand, one hundred one".