20001102212121 has 8 divisors (see below), whose sum is σ = 26668160475840. Its totient is φ = 13334056044912.

The previous prime is 20001102212059. The next prime is 20001102212123. The reversal of 20001102212121 is 12121220110002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20001102212121 - 2⁶ = 20001102212057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20001102212121.

It is not an unprimeable number, because it can be changed into a prime (20001102212123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2050395 + ... + 6648783.

It is an arithmetic number, because the mean of its divisors is an integer number (3333520059480).

Almost surely, 2^{20001102212121} is an apocalyptic number.

It is an amenable number.

20001102212121 is a deficient number, since it is larger than the sum of its proper divisors (6667058263719).

20001102212121 is a wasteful number, since it uses less digits than its factorization.

20001102212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048255.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20001102212121 its reverse (12121220110002), we get a palindrome (32122322322123).

The spelling of 20001102212121 in words is "twenty trillion, one billion, one hundred two million, two hundred twelve thousand, one hundred twenty-one".