1210221021220 has 24 divisors (see below), whose sum is σ = 2542816785600. Its totient is φ = 483830762592.

The previous prime is 1210221021193. The next prime is 1210221021221. The reversal of 1210221021220 is 221201220121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1210221021194 and 1210221021203.

It is not an unprimeable number, because it can be changed into a prime (1210221021221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16064350 + ... + 16139509.

It is an arithmetic number, because the mean of its divisors is an integer number (105950699400).

Almost surely, 2^{1210221021220} is an apocalyptic number.

1210221021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210221021220 is an abundant number, since it is smaller than the sum of its proper divisors (1332595764380).

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

1210221021220 is a wasteful number, since it uses less digits than its factorization.

1210221021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32205747 (or 32205745 counting only the distinct ones).

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

Adding to 1210221021220 its reverse (221201220121), we get a palindrome (1431422241341).

The spelling of 1210221021220 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty".