21212222020101 has 48 divisors (see below), whose sum is σ = 35755787343744. Its totient is φ = 11867960166912.

The previous prime is 21212222020069. The next prime is 21212222020111. The reversal of 21212222020101 is 10102022221212.

It is a happy number.

It is not a de Polignac number, because 21212222020101 - 2⁵ = 21212222020069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212222020111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16203351 + ... + 17463476.

It is an arithmetic number, because the mean of its divisors is an integer number (744912236328).

Almost surely, 2^{21212222020101} is an apocalyptic number.

21212222020101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21212222020101 is a deficient number, since it is larger than the sum of its proper divisors (14543565323643).

21212222020101 is a wasteful number, since it uses less digits than its factorization.

21212222020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33667050 (or 33667047 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21212222020101 its reverse (10102022221212), we get a palindrome (31314244241313).

The spelling of 21212222020101 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, twenty thousand, one hundred one".