1221212122010 has 8 divisors (see below), whose sum is σ = 2198181819636. Its totient is φ = 488484848800.

The previous prime is 1221212121959. The next prime is 1221212122079. The reversal of 1221212122010 is 102212121221.

It can be written as a sum of positive squares in 2 ways, for example, as 1154891966281 + 66320155729 = 1074659^2 + 257527^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1221212122010.

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, 61060606091 + ... + 61060606110.

Almost surely, 2^{1221212122010} is an apocalyptic number.

1221212122010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221212122010 is a deficient number, since it is larger than the sum of its proper divisors (976969697626).

1221212122010 is a wasteful number, since it uses less digits than its factorization.

1221212122010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122121212208.

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

Adding to 1221212122010 its reverse (102212121221), we get a palindrome (1323424243231).

The spelling of 1221212122010 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty-two thousand, ten".