1213221323210 has 32 divisors (see below), whose sum is σ = 2351848700880. Its totient is φ = 447946103808.

The previous prime is 1213221323203. The next prime is 1213221323233. The reversal of 1213221323210 is 123231223121.

It can be written as a sum of positive squares in 8 ways, for example, as 31193564689 + 1182027758521 = 176617^2 + 1087211^2 .

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5442914 + ... + 5661426.

Almost surely, 2^{1213221323210} is an apocalyptic number.

1213221323210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213221323210 is a deficient number, since it is larger than the sum of its proper divisors (1138627377670).

1213221323210 is a wasteful number, since it uses less digits than its factorization.

1213221323210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261242.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1213221323210 its reverse (123231223121), we get a palindrome (1336452546331).

The spelling of 1213221323210 in words is "one trillion, two hundred thirteen billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred ten".