20212221210101 has 2 divisors, whose sum is σ = 20212221210102. Its totient is φ = 20212221210100.

The previous prime is 20212221210091. The next prime is 20212221210109. The reversal of 20212221210101 is 10101212221202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20209969802500 + 2251407601 = 4495550^2 + 47449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212221210101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20212221210101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212221210109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106110605050 + 10106110605051.

It is an arithmetic number, because the mean of its divisors is an integer number (10106110605051).

Almost surely, 2^{20212221210101} is an apocalyptic number.

It is an amenable number.

20212221210101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212221210101 is an equidigital number, since it uses as much as digits as its factorization.

20212221210101 is an evil number, because the sum of its binary digits is even.

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

Adding to 20212221210101 its reverse (10101212221202), we get a palindrome (30313433431303).

It can be divided in two parts, 2021222 and 1210101, that added together give a palindrome (3231323).

The spelling of 20212221210101 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, one hundred one".