2021121201210 has 64 divisors (see below), whose sum is σ = 4984589567232. Its totient is φ = 524104390656.

The previous prime is 2021121201139. The next prime is 2021121201241. The reversal of 2021121201210 is 121021211202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2021121201210.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1468522 + ... + 2489738.

It is an arithmetic number, because the mean of its divisors is an integer number (77884211988).

Almost surely, 2^{2021121201210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021121201210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2492294783616).

2021121201210 is an abundant number, since it is smaller than the sum of its proper divisors (2963468366022).

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

2021121201210 is a wasteful number, since it uses less digits than its factorization.

2021121201210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023047.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2021121201210 its reverse (121021211202), we get a palindrome (2142142412412).

The spelling of 2021121201210 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two hundred one thousand, two hundred ten".