20011212222101 has 4 divisors (see below), whose sum is σ = 20018772184032. Its totient is φ = 20003652260172.

The previous prime is 20011212222097. The next prime is 20011212222137. The reversal of 20011212222101 is 10122221211002.

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 not a de Polignac number, because 20011212222101 - 2² = 20011212222097 is a prime.

It is a super-2 number, since 2×20011212222101² (a number of 27 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 20011212222101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011212222161) 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, 3779976995 + ... + 3779982288.

It is an arithmetic number, because the mean of its divisors is an integer number (5004693046008).

Almost surely, 2^{20011212222101} is an apocalyptic number.

It is an amenable number.

20011212222101 is a deficient number, since it is larger than the sum of its proper divisors (7559961931).

20011212222101 is an equidigital number, since it uses as much as digits as its factorization.

20011212222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7559961930.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20011212222101 its reverse (10122221211002), we get a palindrome (30133433433103).

The spelling of 20011212222101 in words is "twenty trillion, eleven billion, two hundred twelve million, two hundred twenty-two thousand, one hundred one".