1221212101010 has 32 divisors (see below), whose sum is σ = 2399389515072. Its totient is φ = 443822863680.

The previous prime is 1221212101001. The next prime is 1221212101073. The reversal of 1221212101010 is 101012121221.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2985257 + ... + 3369596.

It is an arithmetic number, because the mean of its divisors is an integer number (74980922346).

Almost surely, 2^{1221212101010} is an apocalyptic number.

1221212101010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221212101010 is a deficient number, since it is larger than the sum of its proper divisors (1178177414062).

1221212101010 is a wasteful number, since it uses less digits than its factorization.

1221212101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6356618.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221212101010 its reverse (101012121221), we get a palindrome (1322224222231).

The spelling of 1221212101010 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred one thousand, ten".