212121201022110 has 384 divisors, whose sum is σ = 592193391648768. Its totient is φ = 52581260160000.

The previous prime is 212121201022109. The next prime is 212121201022121. The reversal of 212121201022110 is 11220102121212.

212121201022110 is a `hidden beast` number, since 21 + 212 + 1 + 201 + 0 + 221 + 10 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3617872495 + ... + 3617931125.

It is an arithmetic number, because the mean of its divisors is an integer number (1542170290752).

Almost surely, 2^{212121201022110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212121201022110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296096695824384).

212121201022110 is an abundant number, since it is smaller than the sum of its proper divisors (380072190626658).

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

212121201022110 is a wasteful number, since it uses less digits than its factorization.

212121201022110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59160 (or 59157 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212121201022110 its reverse (11220102121212), we get a palindrome (223341303143322).

The spelling of 212121201022110 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred one million, twenty-two thousand, one hundred ten".