1220021221210 has 48 divisors (see below), whose sum is σ = 2414229539400. Its totient is φ = 443570117760.

The previous prime is 1220021221169. The next prime is 1220021221283. The reversal of 1220021221210 is 121221200221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1080400172929 + 139621048281 = 1039423^2 + 373659^2 .

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7456156 + ... + 7618024.

Almost surely, 2^{1220021221210} is an apocalyptic number.

1220021221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220021221210 is a deficient number, since it is larger than the sum of its proper divisors (1194208318190).

1220021221210 is a wasteful number, since it uses less digits than its factorization.

1220021221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168127 (or 168116 counting only the distinct ones).

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

Adding to 1220021221210 its reverse (121221200221), we get a palindrome (1341242421431).

The spelling of 1220021221210 in words is "one trillion, two hundred twenty billion, twenty-one million, two hundred twenty-one thousand, two hundred ten".