1212211220210 has 8 divisors (see below), whose sum is σ = 2181980196396. Its totient is φ = 484884488080.

The previous prime is 1212211220197. The next prime is 1212211220251. The reversal of 1212211220210 is 120221122121.

It can be written as a sum of positive squares in 2 ways, for example, as 1209997800001 + 2213420209 = 1099999^2 + 47047^2 .

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

It is a super-2 number, since 2×1212211220210² (a number of 25 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 60610561001 + ... + 60610561020.

Almost surely, 2^{1212211220210} is an apocalyptic number.

1212211220210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212211220210 is a deficient number, since it is larger than the sum of its proper divisors (969768976186).

1212211220210 is a wasteful number, since it uses less digits than its factorization.

1212211220210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121221122028.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212211220210 its reverse (120221122121), we get a palindrome (1332432342331).

It can be divided in two parts, 121221 and 1220210, that added together give a palindrome (1341431).

The spelling of 1212211220210 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty thousand, two hundred ten".