210121111201220 has 24 divisors (see below), whose sum is σ = 441358970724504. Its totient is φ = 84028513584896.

The previous prime is 210121111201201. The next prime is 210121111201223. The reversal of 210121111201220 is 22102111121012.

It can be written as a sum of positive squares in 4 ways, for example, as 16387226956996 + 193733884244224 = 4048114^2 + 13918832^2 .

It is not an unprimeable number, because it can be changed into a prime (210121111201223) 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 7 ways as a sum of consecutive naturals, for example, 1245594527 + ... + 1245763206.

It is an arithmetic number, because the mean of its divisors is an integer number (18389957113521).

Almost surely, 2^{210121111201220} is an apocalyptic number.

210121111201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121111201220 is an abundant number, since it is smaller than the sum of its proper divisors (231237859523284).

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

210121111201220 is a wasteful number, since it uses less digits than its factorization.

210121111201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491361959 (or 2491361957 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 210121111201220 its reverse (22102111121012), we get a palindrome (232223222322232).

The spelling of 210121111201220 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred twenty".