210001221222100 has 288 divisors, whose sum is σ = 573913119209472. Its totient is φ = 64791144000000.

The previous prime is 210001221222007. The next prime is 210001221222167. The reversal of 210001221222100 is 1222122100012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3439736575 + ... + 3439797625.

It is an arithmetic number, because the mean of its divisors is an integer number (1992753886144).

Almost surely, 2^{210001221222100} is an apocalyptic number.

210001221222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210001221222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286956559604736).

210001221222100 is an abundant number, since it is smaller than the sum of its proper divisors (363911897987372).

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

210001221222100 is a wasteful number, since it uses less digits than its factorization.

210001221222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65607 (or 65600 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210001221222100 its reverse (1222122100012), we get a palindrome (211223343322112).

It can be divided in two parts, 21000122 and 1222100, that added together give a palindrome (22222222).

The spelling of 210001221222100 in words is "two hundred ten trillion, one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred".