1221211211210 has 8 divisors (see below), whose sum is σ = 2198180180196. Its totient is φ = 488484484480.

The previous prime is 1221211211159. The next prime is 1221211211273. The reversal of 1221211211210 is 121121121221.

It can be written as a sum of positive squares in 2 ways, for example, as 1213075351609 + 8135859601 = 1101397^2 + 90199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61060560551 + ... + 61060560570.

Almost surely, 2^{1221211211210} is an apocalyptic number.

1221211211210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221211211210 is a deficient number, since it is larger than the sum of its proper divisors (976968968986).

1221211211210 is a wasteful number, since it uses less digits than its factorization.

1221211211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122121121128.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221211211210 its reverse (121121121221), we get a palindrome (1342332332431).

It can be divided in two parts, 122121 and 1211210, that added together give a palindrome (1333331).

The spelling of 1221211211210 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred ten".