20212221101 has 4 divisors (see below), whose sum is σ = 20412342204. Its totient is φ = 20012100000.

The previous prime is 20212221067. The next prime is 20212221103. The reversal of 20212221101 is 10112221202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13800375625 + 6411845476 = 117475^2 + 80074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212221101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212221103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100060400 + ... + 100060601.

It is an arithmetic number, because the mean of its divisors is an integer number (5103085551).

Almost surely, 2^20212221101 is an apocalyptic number.

It is an amenable number.

20212221101 is a deficient number, since it is larger than the sum of its proper divisors (200121103).

20212221101 is a wasteful number, since it uses less digits than its factorization.

20212221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200121102.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20212221101 its reverse (10112221202), we get a palindrome (30324442303).

The spelling of 20212221101 in words is "twenty billion, two hundred twelve million, two hundred twenty-one thousand, one hundred one".