212220120021 has 64 divisors (see below), whose sum is σ = 354562306560. Its totient is φ = 109920291840.

The previous prime is 212220120001. The next prime is 212220120023. The reversal of 212220120021 is 120021022212.

212220120021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212220120021 - 2⁶ = 212220119957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220120023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10197895 + ... + 10218683.

It is an arithmetic number, because the mean of its divisors is an integer number (5540036040).

Almost surely, 2^212220120021 is an apocalyptic number.

212220120021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212220120021 is a deficient number, since it is larger than the sum of its proper divisors (142342186539).

212220120021 is a wasteful number, since it uses less digits than its factorization.

212220120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21486.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212220120021 its reverse (120021022212), we get a palindrome (332241142233).

The spelling of 212220120021 in words is "two hundred twelve billion, two hundred twenty million, one hundred twenty thousand, twenty-one".