1221222120010 has 16 divisors (see below), whose sum is σ = 2198282390856. Its totient is φ = 488470498048.

The previous prime is 1221222119989. The next prime is 1221222120073. The reversal of 1221222120010 is 100212221221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 919510305921 + 301711814089 = 958911^2 + 549283^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2012587 + ... + 2548126.

Almost surely, 2^{1221222120010} is an apocalyptic number.

1221222120010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221222120010 is a deficient number, since it is larger than the sum of its proper divisors (977060270846).

1221222120010 is a wasteful number, since it uses less digits than its factorization.

1221222120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4587497.

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

Adding to 1221222120010 its reverse (100212221221), we get a palindrome (1321434341231).

The spelling of 1221222120010 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, ten".