20221021210212 has 72 divisors (see below), whose sum is σ = 51690131602200. Its totient is φ = 6664404307968.

The previous prime is 20221021210189. The next prime is 20221021210297. The reversal of 20221021210212 is 21201212012202.

It is a happy number.

20221021210212 is a `hidden beast` number, since 2 + 0 + 221 + 0 + 21 + 210 + 212 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2459803277376 + 17761217932836 = 1568376^2 + 4214406^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 135804028 + ... + 135952844.

It is an arithmetic number, because the mean of its divisors is an integer number (717918494475).

Almost surely, 2^{20221021210212} is an apocalyptic number.

It is an amenable number.

20221021210212 is an abundant number, since it is smaller than the sum of its proper divisors (31469110391988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20221021210212 is a wasteful number, since it uses less digits than its factorization.

20221021210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191325 (or 191320 counting only the distinct ones).

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

Adding to 20221021210212 its reverse (21201212012202), we get a palindrome (41422233222414).

The spelling of 20221021210212 in words is "twenty trillion, two hundred twenty-one billion, twenty-one million, two hundred ten thousand, two hundred twelve".